As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU LOST PNEUMATIC PRESSURE. EXAMINED APU FMC CDU FAULTS REF AMM 49 61 00 700 801. FOUND FAULT 49 52289 TOTAL PRESSURE SENSOR SHOWS OUT OF RANGE DRIFT. REPLACED TOTAL PRESSURE SENSOR. INSTALLATION TEST PASSES. NO CURRENT FAULTS REF AMM 49 52 32/401.