Hi PaQ - the naked edges here seem to be compressed micro edges and kind of distributed around the shape sort of evenly so it makes it difficult to see where they are.

In Rhino there's a command ShowEdges which will help you locate them in this case because it marks the endpoints of the edges with a control point dot so you can see it even if you can't see the edge itself.

They seem to be clustered in 6 different clumps.

Maybe they'll get squeezed out of existence if you separate the model, scale it down, and then try to rejoin, I'll give that a try first.

- Michael