As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE RIGHT MAIN LANDING GEAR UNSAFE LIGHT ILLUMINATED AT 25,000 FEET. CREW RECYCLED LANDING GEAR AND LIGHT REMAINED ILLUMINATED. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. INSPECTED RIGHT MAIN LANDING GEAR AND REPLACED THE LANDING GEAR PROXIMITY SWITCH CONTROL UNIT. OPERATIONAL CHECK OK.