As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN THE PROCESS OF COMPLYING WITH SB 53-159 BELLY SKIN REPLACEMENT, SOME CORROSION WAS FOUND ON LEFT SIDE OF STRINGER PN 65-56129-10. THE STRINGER HAD TO BE REPLACED. THIS STRINGER RUNS ALONG THE LOWER END OF NR 2 CARGO DOOR. SUBMITTER STATED CAUSE OF THIS CORROSION IS WATER AND DEBRIS LAYING INSIDE THE CHANNEL.