As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTB - NR 1 ENGINE NO BLEED AIR. T/S PER FIM - PNEUMATIC SUPPLY BITE MODULE FAULTED LEFT ENG PRSOV. REMOVED AND REPLACED LEFT ENG PRSOV PER M/M 36-11-09. ALSO REPLACED LEFT ENG BLEED SUPPLY CONTROL CARD IN P50 PANEL PER MM 36-11-12. RAN ENGINE AND PRSOV OP CHECKS NORMAL. NO LEAKS NOTED, BITE MODULE BITE CHECKS GOOD. NO FAULTS.