As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN ZONE TEMP LIGHT ILLUMINATED. ACFT GROUNDED. PERFORMED BITE TEST OF PACK ZONE TEMP CONTROLLERS IAW AMM. NR 1 CONTROLLER FAULTS ZONE TEMP CONTROL VALVE FOR AFT CABIN. R & R AFT CABIN ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21. OPS CHECKED NORMAL.