agreed but 2000 ohms is a lot. I would expect it to be the pir but if you test the tamper switch at 200 ohms this will confirm, testing set on 200k wont show a high reading. It should be very close to 0.3 ohms (not 0.3 K Ohms) plus whatever size the built in series resistor ir (not the ones in the terminals) you could try adding something to the red dot to adjust the close point if the case is slightly twisted