Have a Godzilla Premium thats driving me crazy trying to repair.

Sw 64 which is the VUK exit opto works 100% when the playfield is lifted vertically, but only when it gets put all the way back to its home position where it should be, then the opto stops working (in switch test and gameplay). The game must use this switch to register locked balls - or at least ball 2. I can consistently lock ball 1 in the building, but not ball 2 - it jsut sits up top and game does ball searches.

When the playfield is down, and i interupt the opto beam, the red light on the opto board flashes off - so the opto itself seems to be getting the signal that the switch beam is being broken, but it doesn't translate to a made switch in the switch test or gameplay.

Any tips would be greatly appreciated - and this problem seems to have got worse over time. Was only doing it intermittently, and now is doing it consistently.