What was found
AFTER TAKEOFF UPON FLAP RETRACTION, THERE WAS A FLAP DISAGREEMENT INBOARD PAIR. THE CHECK LIST WAS ACCOMPLISHED AND THE FLAPS AGAIN DISAGREED SO WE RETURNED TO LAX. CLEANED INBOARD FLAP TRACKS, ACTUATOR CANNON PLUGS, AND ALSO RERACKED FLAP CONTROL BOX, CYCLED FLAPS TEN TIMES WITH NO FURTHER DISAGREEMENT. OPS CHECKS GOOD.