As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM: UNABLE TO HEAT FLIGHT DECK CONTROL CABIN FULL HEAT. OPS CHECK AIR CONDITIONING PACKS IAW AMM TASK 21-00-00-862-006. OPERATION OF CABIN TEMP CONTROL NORMAL. PERFORMED FAULT ISOLATION PER DISCREPANCY WRITEUP AND NO FAULTS FOUND IAW 21-61-00-990-822-003.