As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE NR 2 MACH/AIRSPEED INDICATOR FAILED WITH FLAG PRESENT. RETURNED TO DEPARTURE AIRPORT. DURING APPROACH, JUST PRIOR TO TOUCH DOWN FLAG WENT AWAY AND INDICATOR BEGAN WORKING PROPERLY. REPLACED AIRSPEED/MACH INDICATOR. GROUND FUNCTION CHECKED OK.