There are certain things that cause them.
Don't use the cap function on editable polys' borders.
Don't extrude or chamfer edges that only border one edge.
Stuff like that.
The way i found mine was to start with definition #1 (which, in your case, is the object named "Box01") and start detaching groups of faces into their own objects, attaching them to b_levelroot, recompiling, and seeing which definition causes the problem. Once you have the area narrowed down far enough, nuke the whole area and start over, this time using different modeling techniques. It's a painful process and it took me a long time to figure out, but I don't know of anything else. Maybe if I learned to script 3ds max and make something to search all faces and take out the ones with invalid normals...