As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, FLIGHT DECK TEMP EXCESSIVELY COLD. RAN ECL CABIN TEMP COLD CHECKLIST WITHOUT IMPROVEMENT. DESCENDED FOR MANUAL VENTILATION. FLIGHT DECK TEMP REACH 15C AND TRIM AIR/COCKPIT AIR STILL FULL COLD. AMM: 21-61-02-4 FIM: 21-22-00-2/803 NOTE THAT CREW DECLARED EMERGENCY THIS INBOUND FLIGHT. REMOVED AND REPLACED FLIGHT DECK TRIM AIR MODULATING VALVE. ACCOMPLISHED GOOD LEAK AND OPS CHECK USING APU AIR AND VERIFIED TRIM AIR VALVE OPERATES FROM FULL COLD TO FULL HOT POSITIONS IN MANUAL, AND MODULATES IN AUTO. OK FOR SERVICE.