As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COE - C5 CHECK - LAV DRAIN PORT ANCHOR NUT CLIP AT STA X28.000 STR 31R IS CORRODED. NUT CLIP PLATES WERE FOUND TO BE OUT OF LIMITS W/ MORE THAN 10 PERCENT THICKNESS OF CORROSION, IAW SRM 51-14-00. FABRICATED NUT NUT PLATE STRIP IAW DWG 85328857 AND HORIZON AIR TASK CARD 6-53-953. ALODINED IAW SRM 51-21-10-02-01. INSTALLED NUT CLIP PLATE ASSY IAW SRM 51-42-05-02-01. RESTORED SURFACE PROTECTION IAW Q400 51-25-25.