As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF GOT EICAS MESSAGE 'GEAR DISAGREE' AND 'GEAR DOORS' ACCOMPANIED BY LANDING GEAR LIGHT INDICATIONS OF DOORS 'AMBER', GEAR 'AMBER' LEFT 'GREEN' GEAR INDICATION. RECYCLED LANDING GEAR SEVERAL TIMES WITH NO CHANGE. AIRCRAFT RETURNED.L/H MAIN GEAR SIDE BRACE LOCK ACTUATOR AT THE LOWER PISTON HAD SEPARATED FROM THE ACTUATOR BODY.