I started to remove the burner orifice screws and did not lubricate them 1st. Therefore I ended up snapping three of the burner orifice nuts off. I tried drilling them out and had no success. With that being said I had to order 3 new burner orifice assemblies. As I read into this more, all I needed to do was to replace the wiring harness, however you still have to remove the burner screws first. With all that being said, I received the 3 burner orifices, a new ignition harness, and new screws. I put all the parts in after reviewing the how to videos and I had success. My best advice to avoid a costly repair such as mine, is to spray penetrating oil on the burner screws before attempting to remove them. My only complaint is that waiting for the last part ordered took over a week. Other than that everything went well. Do yourself a favor and watch the how to videos before proceeding.