What was found
ON LANDING ROLLOUT PHASE AT FRA, APPROX 20 KTS, SPEEDBRAKES DOWN, REVERSERS STOWED, BRAKES APPLIED, UNCOMMANDED SWERVE TO RIGHT. NOSE GEAR OFF RUNWAY AND MAINS ON RUNWAY. NO EICAS MSG TOWED TO GATE. NO APPARENT DAMAGE TO AIRCRAFT AND NO INJURIES. *S/D* A CHECK OF THE BRAKES, ANTI-SKID, AUTOBRAKE, AND STEERING SYSTEMS FOUND NO FAULTS OR DISCREPANCIES. AIRCRAFT WAS RETURNED TO SERVICE WITHOUT FURTHER REPORTS OF PROBLEM. THE BRAKE SYSTEM CONTROL UNIT WHICH CONTROLS OPERATION OF AUTOBRAKE AND ANTI-SKID SYSTEMS WAS REPLACED AS A PRECAUTION.