As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: APU SHUTDOWN AFTER STARTING AND RUNNING FOR 10 MINUTES. CORRECTIVE ACTION: DEFERRED PER MEL 49-11-01A ON 9-29-21@ 2155Z CAT C AC RELEASED NO ETOPS. REMOVED AND REPLACED GENERATOR FILTER DIFF PRESS SWITCH IAW 767 AMM 49-27-15, OPS CHECK LEAK CHECK GOOD. ETOPS GROUND VERIFICATION COMPLIED WITH.