I'm having an issue with an intermittent weakness in my lower left flipper (premium). About 50% of the shots from that flipper per game are weak. The EOS switch gap looks good, as does the cabinet switch. Both flippers on the upper playfield seem fine. I tried swapping Node Board 8 and Node Board 9 with no luck (set the DIP switches properly). After the switch, I'm not noticing any issues with the upper playfield. I'm also getting weak auto-launcher shots sometimes, but I can't tell if that's because it's actually weak or if the ball is just rattling around the beginning of the orbit and not making it up into the rollover lanes.
Chaz at Stern told me that the voltage is regulated in a manner where if someone were to, say, put an incandescent light in the game it could cause game to exhibit symptoms like this. I'm not the original owner of this game, but I don't think there are any incandescent bulbs in the game (I haven't looked too hard). I do have the Laseriffic topper installed, but I'm 95% certain I had these issues before I installed that.