Charlie, about that "crease"!
It's not really a crease, right? More of an oil canning or depression in the area of the gear legs? I made it to Clinton 2006, where we had scores of 150's and 152's for comparison, and that's one of the things I looked for. I was flying a plane that had the same beauty mark!
Guess what.... they almost every one have it, unless converted to tailwheel! Some of them are more noticeable while others are there, but almost invisible. The reason (I surmised) is that the skin is made of flat sheet metal, but is riveted to bulkheads in the gear area that have different radius curves. This is needed to enclose the gearbox properly, and transition from a curved to a flatter skin. It causes a need for a small compound curve in that immediate area. Since flat sheet metal was used instead of being formed into a compound curve, the result is a very slight "oil canning" of the skin in the gearbox area! I'm sure it helped keep Cessna's production costs down by ignoring this almost invisible blemish.
In short, it's normal! NOT damage!
