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 AT FRAME 19 LEFT SIDE OF THE CENTER FLOOR, FORWARD FUSELAGE FLOOR STRUCTURE UNDER NUTPLATE AS MARKED AND LOCATED UNDER FLOORBOARD 225FLF. REMOVED DAMAGE BY PERFORMING SPLICE REPAIR ON THE LT SEAT TRACK AT FR19 AT UPPER CAP.