As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AIR SHUT OFF WITH SWITCH IN THE ON POSITION NO OTHER INDICATIONS OF ABNORMAL AIR SYSTEM. RAN APU W/ FULL LOAD ON ELEC & AIR BOTH PACKS ON. APU BLEED SW. OPS NORMAL W/ GOOD INDICATIONS. TSR ISSUED. REPLACED APU TOTAL PRESSURE SENSOR PER AMM 49 52 32 OPS AND LEAK CHECK'S GOOD. ACCOMPLISHED APU BITE C/K PER AMM 49 61 00, NO FAULTS NOTED.