As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT - CREW REPORTED SUSPECTED NUMBER ONE ENGINE COMPRESSOR STALL DURING CLIMB THROUGH 25000 FEET. FELT AND HEARD BANG N1 ENGINE PRESSURE RATIO RAPID FLUCTUATION. CREW BROUGHT ENGINE TO IDLE. FLIGHT ATTENDANTS REPORTED EXTREME VIBRATION ON LEFT SIDE OF AIRCRAFT. CREW SHUT ENGINE DOWN AND VIBRATION STOPPED. LANDED ORD WITHOUT INCIDENT. REPLACED NUMBER ONE ENGINE ON 27 OCT AT ORD DUE TO BOROSCOPE FINDINGS.