As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP. GROUNDED - YES. RELEASED PER MEL 21-21G. FLT DECK PRIMARY TEMP CONTROL INOP. CONTROL CABIN TEMP SENSOR FILTER CLEANED REF B737-800 AMM 21-61-06-000-801. ACCOMPLISHED TEMP CONTROL TEST AMM TASK 21-61-00-700-807-002 AND PACK/ZONE TEMP CONTROL BITE TEST AMM TASK 21-61-00-700-806-002. BOTH OPS CHECK GOOD AT THIS TIME. THIS CLEARS MEL 21-21G.