As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT SPLIT BETWEEN LT AND RT DUCT PRESS AFTER T/O TILL APPROX 17000. (INFO: RT PSI 40//LT PSI 13). ALSO SURGED THROUGHOUT CLIMB. DEFERRED LT ENG PRSOV IAW MEL 36-11-01-02A. REMOVED AND REPLACED LT ENG PRSOV IAW AMM 36-11-09. OPS CHECK GOOD.