As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE COMPRESSOR STALL. THROTTLE TO IDLE CLEARED STALL. *S/D* THIS ENGINE EXPERIENCED A GROUP 3 SURGE EVENT. GROUP 3 SURGES ARE THE RESULT OF EXCESSIVE BLADE TIP CLEARANCES IN THE REAR STAGES OF THE HIGH PRESSURE COMPRESSOR. THIS ENGINE WAS REMOVED FOR HIGH PRESSURE COMPRESSOR REFURBISHMENT.