As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN USING THE CABIN, DUCT TEMP SELECTOR KNOB, ABNORMAL TEMPS IN THE CABIN WILL INDICATE ON NEEDLE ON GATE. ALSO TEMP NEEDLE WILL VARY WIDELY WHEN SELECTING CABIN TEMPS AND DUCT TEMPS. ACFT GROUNDED. REPLACED THE TEMP INDICATOR IAW AMM 21-61-00-700-807-002. OPS CHECKED GOOD. BITE TESTED THE ZONE TEMP CONTROLLERS. NO OTHER HISTORY 90 DAYS.