As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ANTI SKID INOP ON LANDING IN SDF (HARD PEDALS AND WHEEL BRAKES LOCKING). RAN & TAXIED AIRCRAFT TO PERFORM OPERATIONAL CHECK AND TO VERIFY SQUAWK. COULD NOT DUPLICATE SQUAWK AFTER SEVERAL ATTEMPTS W/ SWITCH IN EACH POSITION. SYSTEM OPERATES NORMALLY. PERFORMED WORK IAW THE HAWKER 400XP MM CH 32-40.