I opened the drawing attached to this assembly and it came up with an odd issue.  The lines in the attachment that appear to be hidden lines shouldn't be that way.  When I open the subassembly that contains just the tank weldment, there aren't any issues.  Hidden lines are, of course, removed; all other display styles seem to work fine.  It doesn't appear to be showing the hidden lines, its just converting the standard lines into that format.  Has anyone else encountered this problem?