As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CSS FAILED WITH FAULT LIGHT. ACFT GROUNDED. MAINT HISTORY SHOWS 31 FAULTS-MOST RECENT FAULT 49-91227 LOW OIL QTY-158 STARTS OLD. INSURED P2 SENSOR AND FITTING IN PLEUM IS NOT BLOCKED. REF AMM 49-52-31, R & R APU FUEL CONTROL UNIT IAW AMM 49-31-11.