D
Doggit
There appears to be 2 connector blocks for the tamper circuits, and another pair with electrical tape round them; but is it a complete circuit end to end.
Assuming that it is, you're going to need to test each sensor in turn, by connecting them one at a time into the tamper curcuit on the board till you find the one at fault.
Assuming that it is, you're going to need to test each sensor in turn, by connecting them one at a time into the tamper curcuit on the board till you find the one at fault.