As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"BLEED TRIP OFF" ON DEPARTURE, CLIMBING THROUGH 12,000. RAN QRH PROCEDURE."TRIP RESET " DID NOT RESET. GROUNDED - YES. AIR TURNBACK -- REMOVED AND REPLACED PRSOV B737-900 AMM 36-12-02. REMOVED AND REPLACED HIGH STAGE REGULATOR AMM 36-11-07.