As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN GEAR UNSAFE LIGHT DID NOT ILLUMINATE WHILE GEAR WAS INTRANSIT ON RETRACTION. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED BROKEN WIRE FROM LEFT WING ROOT TERMINAL STRIP TO LEFT GEAR UPLOCK SWITCH. OPERATIONAL CHECK OK ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.