What was found
(CAN) AFTER TAKEOFF, UPON FLAP 2, RETRACTION NOTICEABLE VIBRATION OCCURRED ON BOTH FLIGHT CONTROLS. VIBRATION PERSISTED AFTER FLAP 1 RETRACTION, AS SPEED INCREASED SO DID VIBRATION. RETURNED TO DEPARTURE AND AUTOPILOT WAS SELECTED OFF WITH VIBRATION PRESENT TIL ABOUT 180 KBTS ON APPROACH. EICAS MESSAGE ON LANDING AFCS FAULT. RT INBD ACTUATOR CHANGED IN IAW AMM 27-32-01, TEST, RIG ACCOMPLISHED TESTS PASSED WHEN PRESSURE APPLIED TO CONTROL COLUMN IN FWD MOTION AND INDEPENDENT CHECK FOR INSTALLATION.