A tutorial on using Fusion 2013 for importing non-native models and their repair was recently posted here:
http://www.mcadforums.com/forums/viewtopic.php?f=41&t=12873
It includes a pdf file describing the surface modeling environment in general and presenting several techniques for checking and repairing of models. The datasets for the examples described in the tutorial are in an accompanying zip file.
Udaya Gunasena
Fusion Development
Autodesk
