As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6332 - IAD-PIT - DURING CLIMB, AN UNSCHEDULED LANDING DUE TO NR 1 ALTIMETER FLUCTUATED PLUS/- 200 FEET IN CRUISE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE TIGHTENED FITTING AND DRAINED MOISTURE FROM SYSTEM, OPS AND LEAK CHECKED GOOD. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)