I've got a mushy right flipper that I was trying to diagnose, and need some help.
Flippers were rebuilt by previous owner and all mechanical parts look new. Left flipper button opto switch was a newer one, and the right side looked original, so I replaced the right side with a new opto. Some improvement, but wanted to try to see if I could make it better, so I swapped out the original fliptronics board with a new Rottendog. After powering it on the right flipper holds in the up position. Start a game, no response when the right flipper button is pressed. In test menu, the right flipper flips, but struggles to barely move up in the hold test. Do I have a bad/weak coil?