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It will need to go to service. It's usually 5 caps and a couple transistors that go bad. Usually from a power surge or brown out. depending on where you are located will determine where to send it. http://usa.yamaha.com/dealers/service_locator/index.html enter your zip code and you will be directed to the nearest Authorized Yamaha Service Center. The average cost for this repair is between $200-250. Sorry for the bad news! Excellent receiver!
It's muting out because you have a problem with one or both output transistors. Somehow they got shorted out. My speaker wires came loose and crossed blowing the outputs. I'm sure it's repairable but with an amp this old you never know what else burned up down the line. It was a great amp but because of its' age I thew it away.
You can not "reset" protection mode. This is an indication of a defect. Disconnect the speaker wires completely and if the protection mode remains, then the problem is internal to the unit and is likely to be shorted output transistors. Expect a parts cost in the $20-$50 range for this repair.
Could be several causes. Bad connection near the stand-by power transformer or the transformer itself could be open. The main Micro could be bad. This is a job best left to a servicer. Optimus was sold only by Radio Shack, they still do repairs.
There is a problem in the front end that is allowing some DC curent to flow to the output section. This is detected and the amp goes into protect mode to prevent further damage to either the output section or the speakers. This is likely to be defective coupling capacitors and not an expensive repair. Figure on less than $20 for parts for this repair.
Sony has service centers in several areas of maryland. If you go to www.sonystyle.com and "Support" you can find one in your area. Hope this helps. If you can't locate one, I use to Live in MD. What area? post a comment and I can find a good svc center for you.
Any stereo repair shop should be able to repair your amp, as Bogen uses standard parts. I might mention that you may also want to repair you own amp. I would suggest you get a can of WD-40 oil or a tuner cleaner and spray it on the switch you feel is bad. See if this corrects the problem.