As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP LIGHT ILLUMINATED ON MASTER RECALL. ACFT GROUNDED. REPLACED FLT DECK TRIM VALVE V143 IAW AMM 21-61-21. OPERATED BOTH LEFT AND RIGHT PACKS FOR APROXIMATELY 10 MINUTES. OPS CHECKED GOOD. PERFORMED PZTC BITE ON BOTH NR 1 AND 2 CONTROLLERS IAW FIM 21-62-801. NO FAULTS NOTED.