This object has two faces shaded and the rest are wireframe. Any idea how I can fix it?
I guess you have hidden some faces by accident with pressing H.
Press ALT+H to unhide the other faces.
You might try checking the normals too. The normals might be facing wrong direction.
Thank you for your replies.
I had to rebuild the face, though there was probably an easier way to do it too.
Well I can see non manifold geometry and deleted only faces with edges stayed intact.