As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT-SBN - FLT 753 - AFTER TAKEOFF, THE RIGHT MLG UNSAFE LIGHT ILLUMINATED WITH THE GEAR HANDLE UP. THE LANDING WAS CYCLED BUT THE LIGHT REMAINED ON. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE PROXIMITY SENSING CONTROL BOX. (M)