Something strange has happened to my model and I cant get rid of it.

When I view the model using flat shading It looks like the image below



When I view it smooth shaded, some strange shadows have apeared.



These also are evident when I render the image



below is the actual file inMaya 6 ma and mb format.. Could someone please have a look at it and see if they can figure it out.
I have tried everything including remapping all the uvs, checking all the verts are welded correctly, checking all the normals etc..

https://stonks.com/forum/help.zip

HELP