As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1764 - EMERGENCY LANDING - AT APPROXIMATELY 800FT AGL LEFT ENGINE STARTED TO "COMPRESSOR STALL" BEHAVIOR. EGT WENT TO MAX TEMP WITH A DECREASE IN N1 WITH A SLIGHT YAW TO THE LEFT. TOWER REPORTED INTERMITTENT FLAMES COMING OUT OF THE REAR OF THE ENGINE. REMOVED AND REPLACED NR 1 ENGINE IAW 26L40071001. CONFIRMED THAT A LIBERATED PIN IN THE STAGE 3 INNER SHROUD CAUSED THE HPC BLADES & VANES DAMAGES WHICH RESULTED IN THE ENGINE STALL.