As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, GEAR DOOR OPEN LIGHT DID NOT GO OUT WHEN GEAR WAS RETRACTED. RECYCLED GEAR 3 TIMES, LIGHT REMAINED ON. LIGHT EXTINGUISHED NORMALLY WHEN GEAR EXTENDED FOR LANDING AT DTW. REPLACED THE PROXIMITY SWITCH CONTROL UNIT AND OPERATIONAL CHECK GOOD.