As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PSI FROM ENGINES SPLIT DURING TAKEOFF OR CLIMB, WITH L & R ISOL VALVES CLOSED & BLEED SWITCHES ON. L & R DUCT PRESS ARE. CREW COMMENTS: DUCT PRESS SPLIT LEFT ENG 20 AND RT ENG 35 PSI DURING CLIMB. REPLACED FAMV, NO HELP. REPLACED HPSOV. REPLACED PRV NR 1 ENG. LEAK CHECK AND RAN ENG. ALSO BITE CHECK. OP CHECK NORMAL.