As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG DUCT PRESSURES SPLIT DURING CRUISE WITH ISOL VLV CLOSED & BLEED SWITCH SELECTED ON. RECORD DUCT PRESSURES. LEFT 42 PSI. RIGHT 27 PSI. REPLACED HIGH STAGE PILOT CONTROL, DUE TO HIGH PRESSURE SENSE LINE UNION CROSS THREAD REPLACEMENT. PERFORMED RUN UP TO VERIFY DUCT PRESSURE NORMAL AT 26-29 PSI. ENGINE RUN OK PER CREW.