As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATES UPON RECALL. EXTINGUISHES UPON MASTER CAUTION RESET. GROUNDED - YES. REF B737-800 FIM 21-62 TASK 842, PZTC'S BITE PREV FLT SHOWS FLT DECK CABIN SENSOR FAULT. CLEANED AND GVI OF FLT DECK CABIN SENSOR, NO DEFECTS FOUND. BOTH PZTC BITE TESTED GOOD W/O FAULTS. BOTH PACKS OPS CHECKED NORMAL ON GND.