Why have both right-hand speakers suddenly started buzzing when (I think) no connections have been disturbed?

You may be able to find a service manual for your Sherwood RV 7050R amp on the manufacturer's website or by contacting their customer support. Alternatively, you can search for third-party websites that offer service manuals for various electronics. Just be sure to use caution when downloading from unknown sources to avoid any potential risks.

Hello Brian, I sent you the link to download the service manual of your Sherwood RV-6010R
I hope you can solve the problem
Greetings Franco Dosil

Hola Brian, te envio el link para que descargues el manual de servicio de tu Sherwood RV-6010R
Espero puedas resolver el problema
Saludos Franco Dosil
https://elektrotanya.com/sherwood_rv-6030r.pdf/download.html https://www.hifiengine.com/forum/sherwood-rv-6010r-owners-service-manuals-wanted.shtml

Maybe a shorted right speaker took out the other channel. Does it turn on now?

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

You can test the speaker for open or short by touching a small battery to the speaker wires. It should make static or click sounds. If not, it's dead. If it sparks and akes no sound it's shorted and dangerous to any amp.

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections as a root cause for intermittent shutdown.

Make sure the speaker wires are not touching at the back of the receiver or at the speakers. Make sue the cable(s) connecting the two is not damaged or shorted. If the wires are ok then the amp/receiver is the problem. Possible bad capicitors are the problem in the amp.

I would have a look inside, it might be a bad soldering joint that got disturbed in the move. When you get inside follow the wires from the Front-Right terminal.

if bose unit has built in amplifier .Then your sherwood would have to have a variable RCA output jacks in order to work with sub.Then bose audio input RCA cable would connect there.If bose unit does not have built in amp .Then you would connect sherwood left/right speaker outputs into bose left/right inputs .Then other bose speakers will connect to bose unit

make sure you have the speaker connection right if you do then it is a ground problem try plugging it in a different outlet

take amp to a workbench, have a test speaker in hand, touch the speaker wires to each channel to see if all channels work. take each speaker to the amp and temporarily hook one at a time to see if any speaker is bad. if you eliminate the hardware, you know it's the wires in between.