What was found
SDF - FLT 1548 - ON TAKEOFF ROLL FROM SDF, AT APPROX 125 KNOTS, AIRCRAFT EXPERIENCED A BRIEF UNCOMMANDED YAW TO THE RIGHT WITH NO FEEDBACK THROUGH RUDDER PEDALS. AFTER MOMENTARY YAW, REST OF TAKEOFF WAS NORMAL. FLIGHT CONTINUED ON TO PIT WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE YAW DAMPER COUPLER. SYSTEM FUNCTIONAL CHECK PERFORMED AND FOUND SATISFACTORY. ALSO, REMOVED AND REPLACED THE RUDDER POWER CONTROL UNIT (S/N 801ASS, P/N 65C37053-9C). OPERATIONAL CHECK GOOD. (M)