As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT REPORTS FORWARD MAIN LANDING GEAR DOOR SHAKING AND WHEN CLOSED DOOR IS GAPPED. FLIGHT RETURNED TO FIELD, NO EMERGENCY WAS DECLARED BUT RESCUE VEHICLES WERE DISPATCHED TO ESCORT AIRCRAFT TO GATE. ADJUSTED LEFT HAND FORWARD GEAR DOOR ACTUATOR ATTACH ROD.