As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FT # 1158, RETURNED TO FIELD. EXCESSIVE CABIN HEAT WHILE AT ALTITUDE FWD = 116 AFT = 106; REMOVED PACK 2 PANEL. CHECKS FLOW CONTROL VALVE SENSE LINES & CONNECTORS. NO ISSUES NOTED. PANEL REINSTALLED. HOT AIR PRESSURE REGULATING VALVE REMOVED AND REPLACED. SEE LOG 2409959 ITEM 2 MDDR 378643.