As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7941 IAD-BGM. DURING TAKEOFF ROLL THE FIRST OFFICER'S EADI SHOWED A 40 DEGREE TURN AND 10 DEGREES NOSE DOWN ATTITUDE. THE CREW ABORTED THE TAKEOFF AND RETURNED TO GATE. A/C TAKEN OUT OF SERVICE 7-27-04 AT 1745 (LT). IAD MX REMOVED AND REPLACED THE NR 2 AHRS COMPUTER, SYSTEM OPERATIONAL TEST GOOD. A/C RETURNED TO SERVICE 7-27-04 AT 1845 (LT).