Edges are curving while in smooth mode

[hyde_chchnz]

When in smooth, you can see the rest of the mesh looks fine, but one part has the edges curving as they get to the vertices. (pics attached). Theres also a weird black shading issues slightly. 

I have tried:

looking for overlapping vertices, played with the merge threshold but nothing seem to fix it. I also tried selecting all vertices and edges and pressing delete, no changes. 

One other thing I tried was deleting the faces where its broken, then extruding the side back to replace the deleted faces, then merged the vertcies and cut the edges to match the rest of the mesh. When i extruded though the face was black so i flipped the normal of that face and then continued patching the mesh. Still no fix.

Any suggestions? Appreciate it in advanced 

[damaggio]

You need to clean your mesh, inspect again every vertex and use Heads up display.

Zip the file here  if you want.

[hyde_chchnz]

@damaggio 

Thanks for your response. I tried again checking the vertices but can't find it. I put the zip in if you wanted to have a look. 

[damaggio · Accepted solution]

Hi Brady, the mesh is not clean in that area, delete the faces and rebuild.

Also don't forget to clean your file history, you are collecting a lot of junk that could lead to file corruption..

[hyde_chchnz]

Thanks for your time and help!