As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE CAMP UNDERFLOOR INSPECTION, DISCOVERED CORROSION ON SKIN AND BETWEEN SKIN AND DOUBLER AT FS 523 TO FS 531. A REPLACEMENT SKIN APPROX 18 INCH BY 30 INCH WAS FABRICATED AND INSTALLED IN ACCORDANCE WITH THE BEECH SRM AND AIRCRAFT WAS RETURNED TO SERVICE.