As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE COWL VALVE OPEN LIGHT ON WITH SWITCH OFF OVER NEXT HOURS LIGHT CYCLED ON & OFF FLICKERED UNTIL OFF IN AGREEMENT WITH SWITCH POSITION. GROUNDED-YES. FOUND ELECTRICAL CONNECTION DP1303 LOOSE, RESECURED CONNECTOR, REF B737-800 AMM 30-21-11-400-801. OPERATIONS CHECK GOOD.