As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O FOUND CONT CAB ZONE TEMP LIGHT ILLUMINATED. NO INDICATION ON MASTER CAUTION OR MASTER CAUTION RECALL. RAN CHECK LIST ALL OPERATION OF PACK AND PRESSURIZATION NORMAL, PRIOR TO DESCENT LIGHT WENT OUT; THEN UPON RECALL LITE ILLUMINATED THEN EXTINGUISHED WHEN MASTER RECALL WAS RESET. GROUNDED - YES. BITE CK BOTH P2TC #2 SHOWED FLT DECK TRIM VALVE FAULT. RESET AND TEST OK. REF B737-800 FIM TASK 21-62-TASK 801.