As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE APU PNEUMATIC DUCT INSULATION WAS REPLACED IN THE LT SIDEWALL OF THE C-2 CARGO COMPARTMENT AT FS 1351 DUE TO DAMAGED FROM CHAFING WITH THE CARGO COMPARTMENT FIRE EXTINGUISHER DISCHARGE LINE. THE FIRE EXTINGUISHER DISCHARGE LINE WAS RELOCATED TO PROVIDE CLEARANCE BETWEEN THE LINE AND DUCT AT THIS LOCATION. THE (P/N R180FS) INSULATION ON THE FIRE EXTINGUISHER DISCHARGE LINE WAS ALSO REPLACED AT THIS LOCATION.