On a System 11b someone ripped out the original mechanical, reliable flipper and replaced it with this. My problem is F5 - 2 Amp SB on the aux driver board blows occasionally. Chips on this flipper board was sanded off of identification markings. One power transistor was swapped at one point so I know what that is, and I just went ahead and replaced the 3. No difference. Works for days then blows fuse. Today I shotgunned and reflowed solder on this board and the interconnect board where several were cracked. When I took the interconnect board out, the trace right after F5 had previously fried and a wire was added so, this has been problematic in the past.
Anyway, long winded, but is anyone familiar with this flipper board?

Flipper Module (resized).JPG

That's exactly where my head is going at this point. I just needed some encouragement...

Oddly enough at Pastime Pinball where I repair, and the aftermarket mystery board was blowing fuses in Party Monsters, BK 2000 is literally back to back to Elvira. I cut all the stupid wires and nicely put it back to original. No more blown fuses after a week of heavy play by the OCFFB little "monsters". Obsessive Compulsive Flipping Fuse Blowing.