E92 test tune- diagnose HPFP issue.

N54 6mt
RB next gen plus turbos
trying to diagnose a low pressure HPFP. Disconnected my PI controller and uploaded an OTS FF tune with e50 in the tank.Had issues with the LPFP signal being all over the place so I relocated the sensor to my FPR port. LFLP seems to be keeping up fine, but my HPFP is taking a dive. It’s a “brand new” one from FCP. Could it be anything else besides the pump causing the pressure to drop? Anyway to check the PWM signal it is receiving?