As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON TAKEOFF ROLL THE FO'S AIRSPEED INDICATOR WENT INOPERATIVE AT APPROXIMATELY 80 KTS. AIRCRAFT RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE MACH AIRSPEED INDICATOR ON THE F/O'S SIDE IAW BOEING 757-200 MM 34-13-02-4. OPS CHK GOOD. COULD NOT CONFIRM FAULT. UNIT INSPECTED AND TESTED IAW CMM 34-13-09 REV 12.