As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED MASTER WARNING LIGHT ILLUMINATE IN FLIGHT. THE LIGHT STAYED ON FOR APPROX 5 SECONDS, THERE WAS NO SECONDARY SIGNS OF FIRE , BUT ELECTED TO DIVERT, BOTH SMOKE DETECTORS WERE MEL. MX CREW R & R BOTH SMOKE DETECTORS OPS CHECK SATISFACTORY.