What was found
LAX - FLT 224 - EN ROUTE LAX-MCO, AFTER TAKEOFF, WHEN LANDING GEAR HANDLE WAS PLACED TO UP POSITION STRONG VIBRATION WAS FELT IN NOSE GEAR AREA. ALL RED AND GREEN LANDING GEAR LIGHTS ILLUMINATED. LEVER WAS PLACED TO DOWN POSITION AND RED LANDING GEAR LIGHTS EXTINGUISHED, MAIN GEAR EXTENSION ACCESS DOOR WAS CONFIRMED CLOSED. RETURNED AND LANDED LAX WITHOUT INCIDENT. REPLACED LANDING GEAR EXTENSION ACCESS DOOR POSITION SWITCH. ACCOMPLISHED GEAR SWING. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)