As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L ENG BLEED OFF EICAS WITH L PACK OFF CAME ON FL350 2HR30MIN INT O FLT INTERROGATED ASCTU AND FOUND LH PRV FAILED. REMOVED AND REPLACED LH PRV REF AMM 36-11-18 AND PERFORMED OPS AND GROUND CHECKS REF AMM 36-23-00 AND 36-00-26, OPS AND BITE CHECK GOOD. ENGINE RUN, BLEED SYSTEM FUNCTIONS AS REQUIRED.