As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT AT FL350, NR 2 ENGINE EXPERIENCED A COMPRESSOR STALL. THE ENGINE WAS SHUT DOWN AND THE FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND METAL FRAGMENTS IN THE TAILPIPE. THE ENGINE WAS REPLACED WITH A SERVICEABLE UNIT.