As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN HVY CK CORROSION FOUND ON CENTER FUSELAGE 3 FLOOR STRUCTURE LH LONGITUDINAL BEAM AT FR87. REPLACED BEAM PN 170-65669-003 IAW SRM 51-41-01, 51-42-01. SEE AARNRC# 4500861-1000-0040 FOR WORK PERFORMED. AC REMAINS IN YQG FOR COMPLETION.