I'm working on a part which was imported from Pro/E.  It's a jumbled mess of imported solids and surfaces all in one part.  When I try to section it, so I can see inside, I get the message:

"Sectioning at this position will produce invalid bodies. Please select a different section position."

Offsetting the sectoin plane doesn't help, and neither does trimming manually.  I can cut the solid bodies away, but when I try to trim or split the surface bodies, I get a message saying:

"Unable to trim due to error in target body"

Note there are no rebuild errors on this body (all bodies with errors are suppressed).

Is there any way areound this?

Thanks

DH

PS I won't be able to provide any files or images.