That's excellent news about the logic board caps.

Replacing the caps in the power supply sounds like a good idea, but I wonder if is within my powers. I am more of a software guy…

I've pulled the PRAM battery already since it was doing me no good dead and might start to leak. Managed not to break anything, apparently, because we still boot and it's still a little after midnight.

I see a lot of options for replacement PRAM batteries on Amazon. Are there any we like more than others? The one I removed is labelled INORGANIC LITHIUM BATTERY • Size 1/2 AA • 3.6 VOLTS • SL - 150. Conspicuously absent is any mention of mA, which is why I didn't yet order anything.

Yes, things do seem to need dusting. Maybe more. Yick. Any recommendations for cleaning products/rituals?

How does one "bake the PCB at a lower temperature"? (I know what a PCB is, of course.)

Thanks to all who've responded so far — it's much appreciated!