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 SW SELECTED ON. RECORD DUCT PRESSURES. CREW COMMENTS: LEFT 45 PSI RIGHT 30 PSI CRUISE AT 26000FT. APPLIED MEL 3611A. REPLACED HIGH STAGE PILOT VALVE PER AMM. RAN ENGINE AT HIGH POWER PER JRH. VALVE CHECKS NORMAL AND ALL INDICATIONS OKAY.