As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
B18209 DATUM AIRPLANE WAS INSPECTED DURING OVERNIGHT INSPECTION BECAUSE TWO OTHER AIRPLANES IN THEIR FLEET HAD CORROSION COMMON TO THE BELLY SKIN.THE CORROSION WAS FOUND ON THE BELLY SKIN FROM BS 1660 TO 1695,S-51L,S-51R. THIS CORROSION HAS BEEN BLENDED FROM THE BELLY SKIN AND ENSURE THE DAMAGE FREE CONDITION BY HFEC SURFACE INSPECTION AND REPAIR IAW EO 744-53-06-0003 AND IAW TELEX: CHI-TPE-03-00504.