As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING TAKEOFF THE AIRSPEED INDICATORS (CAPTAINS AND FIRST OFFICERS) VARIED BY 10 KNOTS. THIS OCCURRED AT LOW SPEED (BELOW 100 KNOTS). FIRST OFFICERS SPEED SHOW LOW ON APPROACH. REMOVED AND REPLACED FIRST OFFICERS PITOT AIR DATA MODULE (19FP2) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 34-11-17.