I managed to check the bpm wire signal voltage levels when there is no beam in the hall. For the few I ckecked, they matched what I get from the data files. Next I will check the signal level when there is beam in the hall.
signal voltage levels when beam is off 3h07bXM = 2.23 V 3h07aXM = 2.28 V 3h07cXM = 2.20 V 3h07cYM = 2.15 V