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 FOUND CORROSION FOUND ON AFT FUSELAGE WASTE BOX INNER SKIN DOUBLER PN 170-86668-403 FWD INNER SURFACE AFT OF FR88. MX REPLACED SKIN DOUBLER PN IAW SRM 53-23-60 SEE AAT NRC# 45000949-1000-0008 FOR WORK PERFORMED. AC WAS RTS.