What was found
IAD/ROA - FLT 6200 - DURING TAKEOFF AT 2044 HOURS ON 7-24-97, ABORTED TAKEOFF DUE TO RT TORQUE DROPPED TO 90 PERCENT. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND OPENED DMI 07020, MEL 76-2 ON TTL. MAINTENANCE CLOSED DMI 07020 ON 7-28-97 BY ADJUSTING TTL BYPASS TO 660 DEGREES. ENGINE BYPASS WAS BYPASSING AT 650 DEGREES. OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)