As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CABIN CONTROLLER NOT CONTROLLING TEMPERATURE. CONTROLLER DOES NOT RESPOND TO KNOB MOVEMENTS UNTIL A POINT THEN DUCT TEMP GOES FROM 18 DEGREES TO 60-70 DEGREES, WITH LITTLE RESPONSE BETWEEN THAT RANGE. GROUNDED - YES. RESET SYSTEM, RAN BOTH PACKS, TEMPERATURE CONTROL MODULE CHECKS GOOD IAW B737-800 AMM 21-61-00-700-807-002.