As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TEMP GAUGE ERRATIC WHEN TOUCHING SELECTOR KNOB. GROUNDED - YES. VERIFIED FAULT. REMOVED AND REPLACED TEMPERATURE CONTROL MODULE, TEMPERATURE CONTROL MODULE TEST NORMAL, REF B737-900 AMM 21-61-15. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.