As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TEMP SELECTOR ON OVERHEAD PANEL IN FWD SUPPLY DUCT POSITION INDICATES 0-100 AT TIME, ALSO INDICATES A HIGH TEMP. F/A INDICATE CABIN TEMP IS OK. ACFT GROUNDED. VERIFIED DISCREPANCY. R & R TEMPERATURE CONTROL MODULE REF MM 21-61-15. OPS CKS NORMAL REF MM 21-61-00-700-806-002 & 21-61-00-700-807-002.