As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CAB ZONE TEMP LIGHT ILLUMINATED ON RECALL. ACFT GROUNDED. BITE TEST OF ZONE TEMP CONTROLLERS IAW MM 21-61-00 HAS FAULT ON NR 2 CONTROLLER, ZONE SENSOR. FOUND FWD CABIN SENSOR FILTER DIRTY. CLEANED FILTER. OPERATED PACKS AND FWD CAB INDICATES NORMALLY. GROUND VERIFICATION OK REF FIM 21-61, TASK 864.