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I've seen more of these with bad buffer and/or sustain boards than with bad power supplies. Check that buffer board isn't shorted before replacing the sustain board. A shorted buffer board can kill the Y-sustain board.
In your second picture there it looks like there is a heat mark on the Y-sustain board. There will probably be a FET on the other side of the board that has gotten too hot.
I've found and replaced shorted FETs on these before, but more often than not there are other faults. Easier to replace the Y-sustain board with one pulled from another set.
These panels crack very easily. I've cracked a couple myself while handling them (especially frustrating when it happens AFTER you've fixed it).
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