As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING, RECEIVED STATUS MESSAGE OVERBOARD VALVE OPEN AND EQUIPMENT COOLING SMOKE INDICATION LIGHT CAME ON. COMPLIED WITH COM PROCEDURE AND DIVERTED TO DEN. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED SMOKE DETECTOR TS164. PERFORMED OPERATIONAL TEST OF SYSTEM, TESTED NORMAL.