As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION, GEAR DOOR OPEN LIGHT STAYED ON. FLIGHT CREW FOLLOWED COCKPIT OPERATING PROCEDURE AND RECYCLED GEAR, LIGHT REMAINED ON. FLIGHT CONTINUED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LOOSE WIRE ON LEFT MAIN LANDING GEAR DOOR SWTICH. REPLACED THE MAIN LANDNG GEAR DOOR SWITCH AND LEFT AND RIGHT MAIN LANDING GEAR DOOR SWITCHES. OPERATIONAL CHECK GOOD.