As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O GOT LT ENG BLEED TRIP. RESET AS PER QRH. TRIPPED AGAIN. RETURNED DUE TO ICING EN ROUTE. REPLACED PRSOV REGULATOR AND HI STAGE PRESS REGULATOR PER AMM. RAN ENGINES TO T/O POWER FOR 5 MINS. BOTH ENGINES MAINTAINED 50 PSI THROUGHOUT RUN. NO BLEED TRIP.