As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE PRV. PERFORMED AIR SUPPLY BITE CHECKS PER AMM 36-23-00. FOUND L ENG PRV AND L ENG PRVC FAULT CODE. REMOVED AND REPLACED LEFT ENGINE PRV PER AMM 36-11-8 OPS CHECK AND LEAK CHECK OKA. REMOVED AND REPLACED LEFT ENGINE PRC CONTROLLER PER AMM 36-11-19 OPS CHECK AND LEAK CHECK OKAY, AC REMAINS ETOPS 180. PRV PN# 802170-10 SN# 921174 OFF. NO TRAX TIME UNIT INFO FOR EITHER PART.