As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6281 - IAD-HPN - DURING CRUISE, AIRCRAFT DIVERTED TO EWR DUE TO NR 1 ALTIMETER FAILURE. AIRCRAFT WENT TO THE GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEARED PITOT STATIC LINES OF MOISTURE. OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)