What was found
DURING TAKEOFF ROLL, THE SPEED BRAKE LIGHT ILLUMINATED AT ABOUT 70 KNOTS IAS. ABORTED TAKEOFF. SERVICED HYDRAULIC SYSTEMS AS REQUIRED AND PLACED SPEED BRAKES ON MEL, REF 27-03. AIRCRAFT RETURNED TO SERVICE. MEL CLEARED ON 5/8/97 BY CLEANING THE SPEED BRAKE SWITCH, OPERATIONAL CHECKS GOOD.