As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. TAKEOFF REJECTED DUE TO IAS DISAGREE MESSAGES ON BOTH PFDS AND APPROXIMATELY 10 KIAS DIFFERENCE BETWEEN CAPTAIN AND FIRST OFFICER AIRSPEED INDICATORS. REJECT AT APPROX 90 KIAS. GROSS WEIGHT 137,000 POUNDS. FOUND FIRST OFFICER AIRSPEED FLUCTUATES DURING TESTING. REMOVED & REPLACED FIRST OFFICER (RIGHT) PITOT AIR DATA MODULE, PER AMM 34-21-04.