I picked up a Gorgar in pretty good shape a few weeks ago. A handful of lights at the bottom of the playfield were not working; the shoot again, bonus when lit and the multipliers just above the flippers. I replaced all with LEDs and they burnt out in a few minutes. You could see the brightness in these fluctuating prior to sizzling and burning out.
I've cleaned the sockets, replaced the sockets, tested the diodes, tested voltage to those sockets (the same as the sockets that don't kill bulbs) and replaced with incandescent bulbs (those did last about 5 minutes.)
Any suggestions where to look at this point?