As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: INFLIGHT INTEGRATED STANDBY FLIGHT DISPLAY AIRSPEED AND ALTITUDE BECAME UNRELIABLE. CAPTAIN AND FIRST OFFICERS AIRSPEED AND ALTITUDE WERE RELIABLE. REMOVED AND REPLACED INFLIGHT INTEGRATED STANDBY FLIGHT DISPLAY AIRSPEED AND ALT INDICATION PER AMM 34-24-02.