As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INOPERATIVE, NO DUCT PRESSURE. PERFORMED IGU PUSH PULL TEST OF APU IAW FIM 49-11 FAULT TREE 975 AND FOUND LESS THAN 2 PDS FORCE REQUIRED. ALSO, REMOVED AND REPLACED FLOW SENSE VALVE GASKET IAW AMM 49-53-08 AND SURGE CONTROL VALVE AFT RUBBER DUCT IAW AMM 49-53-00.