diodes

Hey All, hoping someone can help point me in the right direction. I'm working on a later revision iMac G4 that has a dead power supply. This is one of the later "USB 2.0" 1Ghz revisions and it has a Samsung power supply unit in it with model number: PSCF161101A. The first thing I noticed was...

I have the typical burning resistor and pair of diodes on my Color Classic analog board (photo of problem area provided, with resistor and diodes circled in red). 2 of them, actually, same exact issue. They both work, but I'd rather not push my luck and fix them while I can. Can someone please...