Have you recapped the Analog board as well ? The capacitors used on the Analog boards of the Classic I and II are from poorer quality than those of earlier Macs. They tend to leak at the bottom.

What are the voltages of the +5, +12 and -12v lines ?

I would test all the SMD capacitors on the logic board for shorts and trace back both leads of each soldered capacitor so there are no broken traces.

If you don't find any failures then the board is likely beyond repair.