As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PRESSURE INDICATES: L R, AFTER T/O (CLIMB) 15 45 CRUISE 15 42 AFTER T.O.D. (IDLE) 12 16. AFTER T.O.D. BOTH DUCT PRESSURE NEEDLES WERE MATCHED THRU LANDING. REPLACED NR 1 PRSOV. FOUND A LEAKING DIAPHRAM REF AMM 36 11 04 000 801. REPLACED NR 1 450 THERMOSTAT AND PRECOOLER CONTROL VALVE SENSOR REF MM'S 36 11 05 AND 36 12 03. C/W PRSOV & PRECOOLER SENSOR INSTALLATION TESTS REF MM 36 11 04 000 801 & 36 12 03 400 801. BLEED AIR OPS TEST GOOD NO SPLIT.