What was found
LAX - FLT QFA 7580 - ON CLIMB-OUT, CREW NOTICED AIRCRAFT HAD SEVERE VIBRATION DURING AND AFTER GEAR RETRACTION, CYCLED GEAR AND FOUND VIBRATION LESSENED, BUT DID NOT STOP, ACCOMPLISHED AIR TURN BACK TO LAX. JACKED AIRCRAFT AND PERFORMED GEAR SWING. FOUND RT MLG DOOR FOLLOW UP SYSTEM OUT OF RIG, RERIGGED RT MLG. FOLLOW UP DOOR SYSTEM AND PERFORMED GEAR SWING UPLATCH CHECK PER MM CH 32-31-5. (M)