What was found
EXPERIENCED EXTREME UNCOMMANDED PITCH OSCILLATIONS ON CLIMB OUT BETWEEN 3 AND 4 THOUSAND FEET. OSCILLATIONS LASTED 10 TO 15 SECONDS. AIR CRAFT CLEAN CONFIGURATION ACCELERATING TO 250 KNOTS. ENGAGED CENTER AUTOPILOT AND OSCILLATIONS CEASED. MULTIPLE HAND FLOWN SEGMENTS BY BOTH PILOTS WITH NO OSCILLATIONS. TURNED BACK TO MEMPHIS AND HELD TO BURN FUEL. WHILE USING CENTER AUTOPILOT ON APPROACH WHILE CONFIGURING AND SLOWING AUTOPILOT DISENGAGED. CAPTAIN THEN BEGAN HAND FLYING AND NOTICED SIGNIFICANT TRIM DOWN FROM AIRPLANE. APPROACH AND LANDING UNEVENTFUL. UPON DEBRIEF DISCUSSED THE FLIGHT CONTROL CHECK THE PITCH FELT LIGHT WITHIN ONE INCH OF NEUTRAL. EMERGENCY DECLARED. AMM 27-31-00-5 REF MTSI 27-30/1349 FOR RIGHT SIDE FUSELAGE BODY CABLE ADJUSTMENTS AND OPS CHKD. NO FAULTS NOTED AFTER ADJUSTMENT. OK FOR SERVICE.AMM 27-31-00-5 REF MTSI 27-30/1349 FOR RIGHT SIDE FUSELAGE BODY CABLE ADJUSTMENT S AND OPS CK S. NO FAULTS NOTED AFTER ADJUSTMENT. OK FOR SERVICE.