As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION STRUCTURAL CENTER FUSELAGE III WET AREA 53-23 LH BEAM Y=-10.748". FABRICATED, DRILLED AND INSTALLED REPAIR DOUBLER FOR LH BEAM BETWEEN FRAMES 87-88 REFER SRM 53-23-10. APPLIED SURFACE PROTECTION TO AREA PER SRM 51-23-06.