As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START FOLLOWING MASTER CAUTION RECALL, THE CONT CABIN ZONE TEMP LITE ILLUMINATED. THIS LIGHT EXTINGUISHED ON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED CONTROL CABIN TRIM AIR MODULATING VALVE REF B737-800 AMM 21-61-21. LEAK CHECK AND OPS CHECK GOOD. GROUND VERIFICATION TEST SUCCESSFUL.