On my Pioneer SA-7500 II, I'm experiencing something that seems eerily similar to what's been described as protection relay "break through". There will be very low output out of one channel then when the volume is raised sufficiently high, the amplifier will suddenly begin to behave normally. I've cleaned the regular switches and potentiometers with Deoxit, and treated the potentiometers to some fader lube; however, the problem is still persisting, so my next thought was to clean the protection relay contacts. Can anyone provide some advice on how to remove the clear relay cover without breaking the cover? On my unit, there's not a lot of room to work in, which is making it hard to figure out how the cover is held in place. I'd also benefit from any advice you may have on safely cleaning the contacts. I've seen comments regarding the use of ultra fine emery paper or some cleaning paper with alcohol. Thanks for chiming in!