What was found
FL 31.0, MACH .84 NOTICED 10 TO 12 DEG R/YOKE DISPLACEMENT. ATTEMPTED TO TRIM RUDDER AND GOT A MOD-SEVERE BUFFET, CONTINUED AFTER SLOWING TO .80 MACH. BUFFET STOPPED WHEN EXTENDING SPEED BRAKES SLIGHTLY 1 TO 2 DEGREES. BUFFET WOULD BEGIN AGAIN AFTER RETRACTING SPEEDBRAKE. DECLARED AN EMERGENCY LANDING INTO ICT. VISUALLY INSP/OPS FLT CONT, T/E AFT FLAPS LOOSE. REPLACED CARRIAGE PLATES AND ECCENTRIC BUSHING ON RT I/B AFT FLAP AND ADJ MM 27-51-2. ADJ ECCENTRIC BUSHING ON LT I/B AND RE-ADJ DROOP ON BOTH I/B FLAPS MM 27-51-2. REPLACED 2 CARRIAGE PLATE ASSYS ON RT O/B AFT FLAP ADJ ECCENTRIC BUSHINGS AND RE-ADJ DROOP O/B FLAPS AND INSP AFT FLAP T/E FLAP RIG MM 27-51-12.