As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY CHECK FOUND CORROSION STRUCTURAL CENTER FUSELAGE I DRY AREA 53-21 LH SEAT TRACK FRAME 16, Y= - 10.748" PERFORMED CUT OUT REPAIR AND INSTALL ANGLE AND DOUBLER REF EMB SRM 53-10-10 R03 AND INSTALLED REPAIR REF EMB SRM 53-10-10 R3 REF SEAT TRACK PN: 170-03264-001.