As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPRESSOR STALLS DEVELOP AS DIFFUSER VANES DETERIORATE. BORESCOPE INSPECTION REVEALS 7 OUT OF 10 ENGINES IN FLEET HAVE 1 OR MORE DIFFUSER VANES CRACKED OR PARTIALLY MISSING. THIS ENGINE REMOVED DUE TO COMPRESSOR SURGE/ STALL EVENTS AND DIFFUSER VANE CRACKS BEYOND MANUFACTURER'S SERVICEABILITY CRITERIA.