As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROLLER CAB ZONE TEMP LIGHT ILLUMINATED DURING MASTER CAUTION RECALL AT TOP OF DESCENT. ACFT GROUNDED. ACCOMPLISHED BITE CHECK OF ZONE TEMP CONTROLLER NR 1 AND NR 2. 1 FAULT, LEG 7 FOR FLIGHT DECK SELECTOR, 21-51311. ACCOMPLISHED FIM 21-62, TASK 862. NO DISCREPANCIES NOTED. SYSTEM OPS NORMAL.