As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) CABIN FLOOR PANEL SUPPORT BEAMS (2OFF) CORRODED. SUSPECT CAUSED BY INCORRECT REMOVAL OF FLOOR PANEL AND GAP SEALANT USING A SHARP EDGED TOOL WHICH SCORED THE BEAMS. CORROSION INITIATED AT THE SCORE MARKS. PERSONNEL/MAINTENANCE ERROR.