Corrosion issue

[JeffAxel]

I would look further, everywhere. Especially in the ceiling above the interior panels, look closely at all structure, take all the inspection plates off and look around. If you see a lot of corrosion, think seriously about another plane, if it is all shiny, maybe the area you saw was a local issue. Look hard at the booms and tail too, and the floor, especially near the door and below the rudder pedals. You can see all of this just by taking up the floor inspection plates. Good luck!