As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL310 WHEN POWER WAS REDUCTED FOR DESCENT, THE NR 2 ENGINE EXPERIENCED A COMPRESSOR STALL. THERE WAS A SUBSEQUENT VIBRATION UNTIL THE ENGINE WAS SHUT DOWN. NO ABNORMAL EGT OR FUEL FLOW INDICATION AT THE TIME OF INCIDENT. FLIGHT CONTINUED TO DTW WITHOUT FURTHER INCIDENT. INSPECTION OF THE NR 2 ENGINE REVEALED NO DISCREPANCIES. BORESCOPE INSPECTION WILL BE PERFORMED IN SEA.