What was found
AFTER INFLIGHT USE OF SPEEDBRAKES, WITH SPEED BRAKES STOWED. AIRCRAFT HAD A STRONG RIGHT ROLL TENDENCY. NO ABNORMAL INDICATIONS. WINGS LEVEL FLIGHT REQUIRED 2.5 UNITS LEFT RUDDER TRIM AND 3 UNITS LEFT AILERON. DURING APPROACH HAD A STRONG RIGHT TENDENCY WITH SELECTION OF FLAPS TO 258 AND 30. GROUNDED - YES. PERFORMED GVI OF FLIGHT CONTROLS, FOUND THE INBOARD ROLLER ON THE R/H TRAILING EDGE FLAP (OUTBOARD) HAS BROKEN OFF AND DEPARTED THE A/C. INSTALLED R/H OUTBOARD AFT FLAP PER B737-900 AMM 27-51-22-400-801. OPS CHECK GOOD.