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When those feedback capacitors in the power supply fail, the B+ will rise to a very excessive level. Often, when this happens, the HOT shorts and the power supply chopper transistor and control IC can also blow up. If you have to replace the HOT, chopper transistor, or the control IC; you really need to try and find OEM parts.
Another problem I've seen is leaking (literally) electrolytic capacitors, mainly in the vertical area, and the electrolyte can eat the traces off the PC board.
Years ago, there was a shop in town that gave me all his junk sets. He hated 169's because he claimed they wouldn't stay fixed. I think the problem was that he was using cheap generic parts and/or under-rated parts. I told him that I'd take all of them that he wanted to give me and out of all the ones I fixed that came from there, nothing came back to bite me.
I stopped having anything to do with him when he told someone, "don't take your stereo to him - all he knows how to fix is all that old tube shit that ought to be thrown away." I found that comment to be very insulting, seeing as how I was fixing a good bit of the SOLID STATE stuff that he had written off.
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