As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL TEMPERATURE CONTROL KNOBS RESULT IN TOO MUCH COLD OR HOT AIR IN CABIN EVEN WITH EXTREMELY SMALL MOVEMENTS TO THE KNOBS. HAVE RECEIVED AT MOST 15 REQUESTS FOR TEMP CHANGES IN THE CABIN FROM FLIGHT ATTENDANTS IN 3 HOURS. GROUNDED - YES. REMOVED AND REPLACED BOTH CABIN TEMP SENSOR FILTERS AND CLEANED BOTH CABIN SENSORS. AUTO CABIN TEMP CONTROL OPS CHECKED GOOD REF FIM TASK 21-61-00.