As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REMOVING LEFT ENGINE FOR TBO REPLACEMENT, INSPECTION OF THE NACELLE STRUCTURE REVEALED THE AFT ENGINE BEAM WAS CRACKED AT THE BEND WHERE THE OUTBOARD TAB ATTACHES TO THE FORE AND AFT ENGINE BEAM. THE CRACK IS APPROXIMATELY ONE INCH LONG AND ORIGINATES FROM THE AFT END OF THE BEND.