As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB LIGHT ON RECALL ZONE TEMP. BITE TEST OF PACK/ZONE TEMP CONTROLLERS SHOWED NO FAULTS AND VERIFY TEST PASSED FOR BOTH WITH NO TRIM VALVE FAULTS. FOUND CONTROL CABIN ZONE TEMP SENSOR AND FILTER VERY DIRTY. CLEANED TEMP SENSOR IAW MM 21-61-10-100-801 AND TEMP SENSOR FILTER IAW MM 21-61-06-100-801 AND PERFORMED TEST IAW MM 21-61-00-700-806-002. OPS NORMAL.