As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK, CORROSION WAS FOUND ON LOWER SKIN AT FRAME 45 BETWEEN STRINGERS 20R AND 20L. CORROSION WAS REMOVED IAW SRM 51-21-58 AND FOUND TO BE OUT OF LIMITS. DOUBLER FABRICATED AND INSTALLED IAW STS ENGINEERING SOLUTIONS EA 12-2011-017. REPAIR PERFORMED BY ACFT TECH SREVICES (MRO) UNDER W/O 17010.