As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTICED CABIN DUCT TEMP HI LIGHT ON MASTER WARNING PANEL, CABIN AIR COMING INTO CABIN WAS HOT, CREW FOLLOWEWD ACFT CHECK LIST TO EXTINGUISH THE WARNING LIGHT AND COULD NOT EXTINGUISH. CREW ALSO NOTED THAT THE AUTO TEMP CONTROL CIRCUIT BREAKER HAD POPPED, AFTER SELECTING TO MANUAL MODE TO CONTROL CABIN TEMP, THE CREW NOTICED THAT THE MANUAL TEMP CONTROL BREAKER HAD POPPED. CREW RETURNED TO DEPARTURE. ACFT WAS AT 35,000 FT ALTITUDE AT OCCURENCE.