panasonic rx 5150

Im posting this in hopes that someone may be able to help me troubleshoot. I also want to bring context to my issue and a previous discussion on this forum that unfortunately didn't end in a "fix." the thread can be seen at this forum post linked below. aside from the squealing - this post...

Apologies if this has been covered, but I couldn't find it. I'm new to restoring these old boxes, though I do have a fair amount of experience with repairing electronics. I'm looking for as much info as I can get, on a complete disassembly and restore. The first problem I have run into is how to...