As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6193 - IAD-JFK - DURING CLIMB, MADE A UNSCHEDULED FLIGHT DUE TO LEFT RPM INDICATION DROPPED TO ZERO. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED TACH GENERATOR AND INSERT, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURNED TO SERVICE. (M)