What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT HAD A VIBRATION FELT ON THE FLIGHT DECK ON CLIMB OUT. VIBRATION WAS FELT FOR ABOUT 5 SECONDS AND THEN STOPPED FOR ABOUT A MINUTE. THIS OCCURRED FROM 12000 FT TO FL 240. IT THEN STOPPED AND DID NOT RETURN FOR THE REMAINDER OF THE FLIGHT. FLIGHT ATTENDANTS IN THE BACK SAID THEY FELT IT CONTINUOUSLY ON CLIMBOUT ON THE AFT GALLEY FLOOR AND THE AFT AIRCRAFT RIGHT LAVATORY. MAINTENANCE REPLACED BOTH ELEVATOR SERVOS AND ELEVATOR HINGE FITTING BUSHINGS 1-6 ON THE RIGHT-HAND ELEVATOR, AS WELL AS THE OUTBOARD ELEVATOR SERVO AND ELEVATOR HINGE FITTING BUSHINGS 1-6 ON THE LEFT-HAND ELEVATOR PER AMM 27-34-41, 27-34-51, 27-34-00.