Imported Mesh disappearing

Hi,

I have a character model I made in Autodesk Maya. When I imported it into Unity, his entire lower body was neither visible nor existent on the hierarchy. His leg bones were in the skeleton hierarchy in mechanim, but were not visible or considered bones. I used the Cleanup function in Maya with the homes of fixing it. However, this made it worse; now the entire mesh is gone and not in the model's Unity hierarchy except for the hands, teeth, and eyes.

Anybody have any idea what's going on here?

The original model

How Unity sees it