As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD CABIN ZONE TEMP ILLUMINATED DURING RECALL. LIGHT EXTINGUISHED WHEN MASTER CAUTION RESET IAW QRH 215. ACFT GROUNDED. NR 2 ZONE TEMP CONTROLLER BITE REF FIM 21-62, TASK 801 SHOW ZONE TRIM VALVE FAULT. FOUND AFT COMPARTMENT PASS. ZONE TRIM AIR MOD VALVE BAD. REPLACED AFT PASSENGER COMPARTMENT ZONE TRIM AIR MODULATING VALVE REF AMM 21-61-21. OPS CK AND LEAK CK GOOD.