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 FWD FUSELAGE LH DOUBLER FOUND CORRODED BTWN FR19. AAR MX REPLACED DOUBLER PN 170-07311-001 IAW SRM 51-41-02, 51-43-02. AC REMAINS IN YQG FOR COMPLETION. SEE AAR NRC# 4500895-2000-0167 FOR WORK PERFORMED.