As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT TEMP ERRATIC. KNOB POSITION AND DUCT TEMP DO NOT CORRELATE. DURING CRUISE WITH OAT -54C. ACFT GROUNDED. IAW AMM 21-61-00-700-807-002, CABIN TEMP CONTROL & INDICATION OPS TESTED. COULD NOT DUPLICATE. OPS TESTED NORMAL. CLEANED FLT DECK TEMP SENSOR FILTER IAW AMM 21-61-06. NO HISTORY 30 DAYS.