As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL THE RUDDER PEDALS KICKED HARD LT CAUSING LOSS OF DIRECTIONAL CONTROL. ABORTED TAKEOFF AND TAXIED TO RAMP. MX PERFORMED A RUDDER BOOST TEST AND NOTED DURING RUN-UP THAT THE RT ENGINE RUDDER BOOST DID NOT RESPOND. THE LT ENGINE RUN-UP CAUSED THE RUDDER BOOST TO ACTIVATE. REMOVED AND REPLACED RUDDER BOOST DIFFERENTIAL SWITCH MFG PN 658-7C (P/N 101-384119-1) S/N OFF 4923 - S/N ON 6508.