As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 PYLON, THE INBD UPPER AFT HOLE THROUGH THE PYLON SKIN AT THE THRUST REVERSER AFT HINGE FITTING WAS FOUND TO HAVE A CRACK INDICATION DURING HFEC INSPECTION. REMOVED CRACK BY REAMING THE OUTER SKIN ONLY TO .640 & INSTALLED A FREEZE PLUG IAW EA B757-54-033849.