I had one bad tamper switch on an NC-900 that took ages to find. It was the switch at the front of the chassis for the front (lens area) panel.
The switch was physically OK, contact was being made, resistance seemed to indicate the circuit was closing when switch depressed etc, but the projector just would not accept it and I couldn't clear the tamper. After swapping this switch with another one, the problem went away, and the 'bad' switch worked just fine in the other projector I had swapped it from, so I left them swapped and never heard another issue from either of them...
The switch was physically OK, contact was being made, resistance seemed to indicate the circuit was closing when switch depressed etc, but the projector just would not accept it and I couldn't clear the tamper. After swapping this switch with another one, the problem went away, and the 'bad' switch worked just fine in the other projector I had swapped it from, so I left them swapped and never heard another issue from either of them...
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