What was found
MKE - FLT 4234 - DURING APPROACH, FLAP EXTENSION LIGHT ILLUMINATED. FLAPS VERY SLOW TO RETRACT, AFTER EXTENSION, FLAPS RETRACTED. FLAPS EXTENSION AND RETRACTION INTERMITTENT. REMOVED AND INSPECTED FLAP VALVE BLOCK RESTRICTORS IAW JIC 27-54-21, OPS CHECK AND LCK GOOD. AIRCRAFT WAS RETURNED TO SERVICE. PART TOTAL CYCLES, 26297.0. REFERENCE, OPERATOR CONTROL NR SIMA953052.