As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, WITH PNEU PRESS NORMAL A/C PACKS WOULD NOT COOL CABIN BELOW 81 DEGREES F. ATTEMPTED SELECTING WARM TEMP THEN PACK TO COLD, NO HELP. BITE CHECKED TEMP CONTROLLER PER MM 21-61-00 REPLACED RT PACK TEMP CONTROLLER PER MM 21-61-03-400-005, OPS CK OK FOR SERVICE.