As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HVY CK CORROSION FOUND ON CENTER FUSELAGE 3 FLOOR STRUCTURE RH LONGITUDINAL BEAM AT FR87 REPLACED BEAM PN 170-65669-004 IAW SRM 51-41-01, 51-42-01, 51-43-01. AC REMAINS IN YQG FOR COMPLETION. SEE AAR NRC# 4500861-1000-0039 FOR WORK PERFORMED.