I am going through annual hell. We (AME) found missing rivets at the wing root just ahead of the drain. There appears to be a small burn make there and my AME (very experienced) has seen this before. He thinks my airplane suffered a lightning ground strike. All else is well.
I will jump ahead here, I have stripped the sealant from the tank. This is one of the must unpleasant tasks I have ever had to do. We have found corrosion to the T shaped extrusion of the rib. This would have never been visible had we not removed rivets allowing us to pull the skin down. I am fortunate to have a very experienced aviation sheet metal man. I'm assisting him. He feels this is repairable.
Does anyone have a part number? Can I get this from Mooney?