As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHIME ALERT *LEFT DUCT PRESSURE LOW* DURING CLIMB. PERFORMED #1 ENGINE PNEUMATIC SYSTEM TROUBLE SHOOT IAW FIM 36-10 TASK 805, FOUND PRSOV LEAKING AT DIAPHRAGM. REMOVED AND REPLACED #1 ENGINE PRSOV IAW AMM 36-11-04/401, OPS TEST GOOD NO LEAKS NOTED.