As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TOW BAR STEERING PIN BROKE DURING, PUSH LOUD BANG HEARD IN COCKPIT. REPAIRED TOWBAR AND RETURN AC TO GATE . MTX GROUNDED AC AND PERFORMED MAX LOAD CONDITIONAL INSPECTION (PHASE I INSP) IAW B767 AMM 05-51-29. NO DEFCTS NOTED. AC WAS RETURNED TO SERVICE.