As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4175 - CREW SELECTED GEAR 'UP' DURING CLIMB-OUT, UNSAFE GEAR LIGHT REMAINED ILLUMINATED FOR BOTH LT AND RT MLG. CREW SELECTED GEAR DOWN AND RETURNED TO THE FIELD. PIT MAINTENANCE INSPECTED AIRCRAFT AND FOUND ICE AND SAND CONTAMINATION IN RT MLG UPLOCK ROLLER. CLEANED AND LUBRICATED ROLLER, CONDUCTED TEST FLIGHT. AIRCRAFT RETURNED TO SERVICE.