As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PSM - SFB - CREW REPORTED THEY DISCONTINUED THE TAKEOFF DUE TO POSSIBLE TOWBAR PIN STILL IN AIRCRAFT. AIRCRAFT RETURNED TO GATE. MAINTENANCE UPON VISUAL INSPECTION FOUND NO EVIDENCE OF BROKEN TOWBAR PIN STUCK IN NOSEWHEEL HUB NOR DAMAGE TO ANY PART OF NOSEWHEEL OR NOSEWHEEL ASSEMBLY. AIRCRAFT RETURNED TO SERVICE