As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP CONTROL FAULTED THE FLT DECK TRIM VALVE. ACFT GROUNDED. ACCOMPLISHED FIM 21-62-00-810-832. R & R CONTROL CABIN ZONE TRIM AIR MODULATING VALVE REF MM 21-61-21-400-801 THRU STEP F. (4) . LEAK & OPS CHECKED GOOD MM 21-61-21-400-801 COMPLETED.