As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GEAR RETRACTION, AFTER TAKEOFF, CREW HEARD A LOUD BANG IN THE NOSE GEAR WELL AREA AND NOTED A RUBBER BURNING ODOR. AIRCRAFT RETURNED TO THE DEPARTURE AIRPORT AND LANDED SAFELY. MAINTENANCE PERFORMED SEVERAL GEAR SWINGS BUT COULD NOT DUPLICATE THE DISCREPANCY.