As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATED. RAN CHECKLIST. EXTINGUISHES ON MASTER CAUTION RESET. TEMP CONTROL APPEARS NORMAL. GROUNDED - YES. PERFORMED B737-800 FIM 21-62 TASK 848 AND PZTC BITE PROCEDURE REF FIM 21-62 TASK 801. TEST PASSED. RAN BOTH PACKS, OPS NML. ETOPS GND VERIFICATION GOOD.