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Jay,
The inspections that were done were visual inspections only. The mechanic that swapped the engines did visual inspections for cracks and corrosion. My 337 only has about 800 hours on it and the mechanic indicated that if the plane had high hours or had been operating or stored in a corrosive environment, he would have removed the mount and sand blasted the paint off and inspected further. If then an indication was found, he would send it out to a shop that specializes in mount repairs. He did not recommend a shop and I don't have any personal experience with one. There is an ad in Trade-a-Plane for Aerospace Welding in Minneapolis. As for the cost, this took place as part of the engine change, I don't think it took a great deal of time to do while the engine was out of the way. I hope this helps, Todd
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