What was found
A-C PULLS TO RIGHT ON TAXI. CONTINUOUS LEFT TILLER REQ TO TRACK STRAIGHT. MAINT TEXT: DURING TAXI TEST LEFT RUDDER TRIM REQUIRED TO KEEP AIRCRAFT STRAIGHT. REPLACED BSCU PER MM. TAXIED AIRCRAFT WITH ALLOWABLE TRIM INPUTS OF UP TO 3 DEGREES TO STEER STRAIGHT. CHECKED AND ADJUSTED NWS SENSORS 3GC AND 4GC. AIRCRAFT STILL PULLS TO THE RIGHT AND 7.9 DEG OF RUD TRIM TO LT TO CORRECT. REF TSM: INSPECTED TIRE PRESSURES, NLG STEERING LINKS, TIRES AND BSCU FOR FAULT CODES: NONE PRESENT. REVIEWED HISTORY: THIS ITEM TO BE CLEARED IN 10 CYCLES IF NO FAULTS REOCCUR.