After importing a set of surfaces into SolidWorks, I am attempting to knit those surfaces in order to convert it into a solid. SolidWorks give an error message that one of the surfaces in non-manifold. Is there a way to get SolidWorks to identify the surface or surfaces that are non-manifold so that I can repair them manually?

Even after repairing invalid faces and geometries with evaluate>check, there are still non-manifold surfaces. Any suggestions?