As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6181 - IAD-BWI - ABORTED THE TAKEOFF, DUE TO THE RIGHT ENGINE RPM FLUCTUATING. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED THE RT TACH GENERATOR. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)