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The Eden has a thermostatically controlled fan, my first thought is to clean the fan and airways and make sure it is working properly. This relates to some heat problems on solid state stuff. If they get too hot, some shut off for protection, the fan should automatically speed up on this model to compensate. When volume is low watch the fan. Also, make sure the impedance switch is set properly. I've very rarely seen any reason to use 2ohms settings. The only way to run that is with 2 4ohm cabinets in parallel. If they are in series it would become 8ohm. Any other way will make the amp get too hot on 2 ohm setting. Most cabs are 4, 8, and 16.
swap speakers to compare that the second speaker by itself is the same as the first. Next thing is to verify the phase. If the speakers are at different distances from the listener, phase cancellation may be occuring.
Here is your schematic for the power amp. There is a separate amp for the tweeter using a LM3886 which is fairly well protected. Open the unit and test the tweeter driver.
Scroll down to "Get Manual" and click on it to download the schematic. At the site is also the preamp section as a separate schematic. You probably don't need that for the failure you are seeing. A lot of the tweeter drivers seem to get blown up, but once you test you will be able to find if the problem is in the amp or the driver.
Scroll down to "Get Msnusl" link and download. Leaving it on should NOT have caused a failure, however, if it was running and the input was not being driven there may have been feedback going on that did damage. Only thing to do is take it for repair.
In the schematic ignore all the extra switches and junk. The output jack and volume control is all you need to wire it back up. The view of the volume control is from the back.
Cost by replacing the amps would NOT be cost effective.
In looking at the schematic, assuming there was a voltage surge on input power, possibly the diodes and capacitors in the power supply are damaged if the fuse blew and was replaced.
If the speakers were powered by a different receptacle than the source feeding the audio to these was, ground bounce may have destroyed the first input stage.
You need to give us current symptoms so we can direct replacement of bad components.
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