As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAD NR 1 ENGINE SHUTDOWN AS A PRECAUTIONARY MEASURE DUE TO NR 1 ENGINE TORQUE FLUXING BETWEEN 50 AND 90 PERCENT. CABIN WAS ADVISED OF EMERGENCY, BUT DID NOT ASSUME THE BRACE POSITION. MAINTENANCE GROUND RAN AIRCRAFT AND COULD NOT DUPLICATE. MAINTENANCE REMOVED AND REPLACED NR 1 ELECTRONIC ENGINE CONTROL UNIT. GROUND RAN AIRCRAFT, ALL CHECKS GODD. AIRCRAFT RETURNED TO SERVICE.