As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7486 - IAD-BUF - DURING TAKEOFF, CREW ABORTED TAKEOFF DUE TO NR 1 ENGINE RPM ROLLED BACK TO 99.5 PERCENT. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND ADJUSTED X-SCREW, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)