As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROLLER CABIN ZONE TEMP LIGHT ILLUMINATED UPON RECALL, EXTINGUISHES UPON MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED TEMP CONTROLLER BITE, NR 1 AND NR 2 TEMP CONTROLLERS BOTH SHOW FLT DECK TRIM VALVE FAULTS ON BITE AND PREVIOUS FLTS. REPLACED CONTROLLER CABIN ZONE TRIM AIR MODULATING VALVE REF MM 21-61-21. PERFORMED BITE TEST ON PACK/ZONE TEMP CONTROLLERS REF MM 21-61-00. NO FAULTS NOTED.