As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT. CAB ZONE TEMP LIGHT ILLUMINATED. PERFORMED QRH CHECK LIST LIGHT REMAINED ON. LIGHT GOES OUT WITH MASTER CAUTION RESET. FAULT CODE 216 271 00. GROUNDED YES. REMOVED & REPLACED CONTROL CABIN ZONE TEMP TRIM AIR MODULATING VALVE REF MM 21 61 21 400 801.