As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CMH - DIVERSION - FLT 0081 - EN ROUTE FROM PHX TO BWI FIRST OFFICERS ALTIMETER FLAG DISPLAYED, TURNING BAROMETRIC KNOB MOVES MB AND HG DRUMS BUT ALTIMETER NEEDLE DOES NOT MOVE. DUE TO WEATHER AHEAD DIVERTED TO CMH. MAINTENANCE REMOVED AND REPLACED FIRST OFFICERS ALTIMETER IAW BMM 34-13-01-4 PG 1 & 2. OPERATIONAL CHECK WAS GOOD.