As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PRESSURE DIFFERENTIALS EXCEEDS 20 PSI DURING CLIMB AND IN CRUISE DUCT RIGHT PSI 40 DUCT LEFT PSI 17 DUCT PRESSURES WERE MATCHED DURING DESCENTS. ACFT GROUNDED. ACCOMPLISHED FIM TASK 36-00-00-860-807. FOUND PRSOV LEAKING EXCESSIVE AIR, R & R PRSOV IAW AMM 36-11-04. OPS CHECKED AND LEAK CHECKED NORMAL.