As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/BNA - FLT 6704 - DURING CRUISE AT 1755 HRS ON 1-5-98, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO NR 1 ENGINE N2 INDICATION WENT TO ZERO. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEANED ALTERNATOR CANNON PLUG, OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)