As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ONLY APPROXIMATELY 5 PSI BLEED AIR PRESSURE, UNABLE TO START ENGINES. ITEM TRANSFERRED TO DMI NR 138466, IAW DDG MEL 49-11-01A CAT C DUE 05DEC20. MCC NOTIFIED, PLACARDS INSTALLED. PERFORMED OPERATIONS TEST APU BLEED AIR SYSTEM, PER AMM 49-52-00 NO FAULTS ON ECU. OPERATIONS GOOD ON DRY MOTOR LT & RT ENGINES. DMI CLEARED PLACARDS REMOVED.