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 WARM FLIGHT DECK AT ALTITUDE EVEN WITH CONTROL CABIN ON MAX. PERFORMED TEMP CONTROLLER BITE TEST AS PER AMM 21-61-00 CONFIG 3 NO FAULTS FOUND. CLEANED COCKPIT TEMP SENSORS AS PER AMM 21-61-00 PG 701, OPERATED PACK WITH APU & WITH ENG BLEED AND SYSTEM OPS CK NORMAL ON GROUND AS PER AMM 21-61-00.