As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE THE FLIGHT CREW REPORTED LAV SMOKE INDICATION. AS A PRECAUTION FLIGHT WAS DIVERTED TO GRR. AIRCRAFT LANDED WITHOUT INCIDENT. PASSENGERS DEPLANED, MAINTENANCE PERSONNEL FOUND LAV SMOKE DETECTOR INOPERATIVE. SMOKE DETECTOR WAS REMOVED AND REPLACED. A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED. AIRCRAFT WAS RELEASED FOR CONTINUED SERVICED NORMALLY AT GATE.