As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O WHEN GEAR RETRACTED, A LOUD THUMP WAS HEARD AND SHUTTER WAS FELT. AFTER RETRACTION RT MAIN UNSAFE LIGHT ILLUMINATED. RECYCLED LANDING GEAR UP/DOWN AND STILL HAD A RED UNSAFE LIGHT W/GEAR UP POSITION. LOWERED LANDING GEAR, NO UNSAFE LIGHT. RETURNED TO FIELD FOR NORMAL LANDING. REF CITEX FOR RIGHT MAIN LANDING GEAR CHANGE AND GEAR SWING W/ NO DEFECT NOTED AT THIS TIME.