As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED TRIP WHILE DESCENDING BUT WERE DOING A SHALLOW DESCENT WITH POWER. FOLLOWED CHECK LIST AND LIGHT WENT OUT ON RESET. PRSOV FAILED TROUBLESHOOTING STEP 5B AND FOUND PRECOOLER VALVE POSN IND OVERRIDE NUT BROKEN. REPLACED PRSOV AND PRECOOLER CTRL VLV PER AMM 36 11 04 AND 36 12 02, OPS CHECK GOOD. RECHECKED PRSOV STEP 5B AMM 36 00 00 101. PRSOV PASSED. RAN ENGINE PER AMM 36 11 00 ENG BLEED AIR OPS CHECK GOOD.