As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2107 CABIN AUTO TEMPERATURE CONTROL INOPERATIVE. MANUAL MODE WORKS FINE AND FLIGHT COMPARTMENT AUTO-MANUAL WORK. RAN CHECKLIST AND RESET CIRCUIT BREAKER, STILL UNCONTROLLABLE IN CABIN AUTO MODE. PERFORMED FUNCTION TEST OF TEMPERATURE CONTROL SYSTEM TASK 21-60-00-720-801 IAW DHC-8 AMM. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.