As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE DTW-MSP, THE NR 3 ENGINE REVERSER UNLOCK LIGHT ILLUMINATED. CREW FOLLOWED COM PROCEDURE, SHUT DOWN THE ENGINE, AND CONTINUED TO MSP WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED VIBRATION AND WINDMILLING CHECKS. REVERSER WAS ALSO CHECKED FOR STOW AND PROPER LOCKOUT. ALL CHECKS WERE NORMAL AND AIRCRAFT RETURNED TO SERVICE.