As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTO FIRST OFFICER AIRSPEED UNRELIABLE, INOPERATIVE FLAG DISPLAYED. F/O MACH AIRSPEED INDICATOR FOUND TO BE FAULTY. AIRSPEED INDICATION FOUND TO BE ROLLING BETWEEN 29 & 30 KNOTS CONSISTENTLY. CREW DEBRIEF SHOWED 8-10 KNOTS DIFFERENCE DURING TAKEOFF ROLL AND FLAG DISPLAYED INTERMITTENTLY. F/O MACH AIRSPEED INDICATOR REPLACED IAW AMM 32-13-02/401, & CHECKED GOOD. OK TO CONTINUE.