It may be a geometry error. To check, use the "examine geometry" command.
In the model file, use the examine geometry command; check all the body and face checks then window around the body to select everything (body, faces, & edges). It needs to pass the "body consistency" and "face self-intersection" tests. Strange things can happen in the model or drawing if it does not pass these tests.
Just checked it and had nothing horrible to report. I even went and removed the blends attached to the area that is being ommited. Still same result.
Are you placing the view as a Smart Lightweight view or as an Exact view? You can tell which type you're using by checking the Common-->Configuration node-->Format group-->Representation option in the Style dialog box for the view. If you're using a Smart Lightweight representation, you may need to set other options for the view. .
One thing you might want to try is to set the Representation option to Exact (Pre-NX 8.5). If you don't see Exact (Pre-NX 8.5) as an available option, do this:
Now create your view and make sure to set the Representation option to Exact (Pre-NX 8.5) before placing the view. You have to set this option before you place the view because you can't convert an existing view.
It is a single component and it is not happening to just this part, it is happening to other drawings different faces.
When I turn off the hidden lines. nothing changes except I can see the lines that were previously hidden.
I am sorry I cannot provide the file because it is proprietary.