As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INLET INTERNAL ACCESED FROM 311 SHOWS SIGNS OF ADVANCED CORROSION AND DELAMINATION AROUND NUTPLATES AND AREA WHERE DUCT ATTACHES TO FUSLAGE ON ALL SIDE. REMOVED UPPER AND LOWER NUT PLATE SUPPORT ANGLE AT APU INLET INTERNAL IAW SRM 51-40-02-G-0. FABBRICATED REPLACEMENT ANGLES IAW BOEING DWG. # 148N3152. R & R SUPPORT ANGLE AND STRAP IAW DWG 148N3152, 148N3141, AND 148N3138 IAW SRM.