I'm working on a friends Meteor that is having a strange issue that I can't figure out. In switch test, it's showing that switch 8 (slam/vibration tilt) is active. I've checked all 3 of the slam/vibration tilt switches (coin door, inside left cabinet and underside of playfield next to the left flipper mech). The diodes, switches and wiring on all three are good. I've even unsoldered the wiring at the switch for those 3 switches but it still shows switch 8 active. It's not the MPU board as I tested it in my Meteor and it works fine. All the MPU connectors have been repinned as well.
I've went thru and checked the diodes including all the switches up from switch 8 and they are good. All the switches under switch 8 register in switch test but nothing over 8 will register. That is normal behavior for a switch # above the switch that is active to not register in switch test as my Meteor does this as well.
One odd thing is that when I manually close the slam tilt switch by the left flipper mech, a few of the insert lamps flicker while it's closed. The other two slam tilt switches do not do this.
This one has got me stumped. Any ideas?