As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMP TOO COLD. FLT DECK-FWD CABIN-AFT CABIN TEMPS FLUCTUATE-JUMPS UP AND DOWN FOR NO APPARENT REASON. REPLACED TRIM AIR PRESSURE REGULATING AND SHUTOFF VALVE, NO HELP. INSTALLED NEW FWD TRIM AIR VALVE. FWD CABIN TEMP CONTROL OPERATIONAL CHECKS NORMAL.