Panasonic TCP50C2

[kf4rca]

I heard that you can hold the button down for 10 seconds and it will show you another code, if you have one.
If your diodes check OK, I'd check the MOSFETs, or anything that looks like a MOSFET, for short.
I think the EEPROMs are all the same on those "A" boards for most of those boards of that design.