As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ECS TEMPERATURE INDICATIONS SHOW ERRONEOUS READINGS FOR ALL SEVEN POSITIONS. ALL SEVEN INDICATIONS SHOW WELL BELOW 20C. FLIGHT ATTENDANT REPORTED NORMAL TEMPERATURE IN BOTH FWD & AFT CABIN WITH THE INACCURATE READINGS. ACFT GROUNDED. CYCLED AIR TEMP SWITCH FOR CONTROL CABIN AND PASSENGER CABIN, NO DEFECTS NOTED WITH TEMP INDICATIONS.