As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6372 - IAD-AIB - DURING CRUISE, MADE AN UNSCHEDULED LANDING DUE TO RIGHT RPM FAILED IN FLIGHT. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED TACH GEN, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)