What was found
T/O UNSAFE EICAS ILLUMINATED DURING TAKEOFF ROLL. ABORTED AT 120 KNOTS. ATTEMPTED TO DUPLICATE INDICATION IN HANGER WITH EXTERNAL POWER SUPPLIED, COULD NOT DUPLICATE. INSPECTED ALL 8 AIRBRAKE SWITCHES VISUALLY FOR OBVIOUS DEFECTS, NONE NOTED. RANG OUT AIRBRAKE SWITCHES FROM CONNECTOR 364P AND FOUND INTERMITTANT SHORT TO GROUND AT PIN BB. ISOLATED SHORT TO PIN 2 AT TB 112. FOUND SHORT TO EXIST ON WIRE 2-20 OF AIRBRAKE SWITCH 48C. REMOVED AIRBRAKE SWITCH P/N MS27240-7 NSN AND INSTALLED NEW AIRBRAKE SWITCH P/N MS27240-7, NSN AS NEEDED. WORK ACCOMPLISHED IAW G200 M/M 27-60-20.