Take the grate off by pulling straight up. Watch the 4 rubber grommets as they are easily lost. Then push the pan to the rear to unhook the front latches and lift the front enough to clear the burners and slide it forward to release the rear latches. When you hit the igniter see which is not firing. Slide a DRY dish towel under the wire going from the burner to the sparker mechanism. If the igniter sparks, you have a breakdown of the insulation on the wire going to it. It can be replaced or removed and covered with shrink tubing or liquid tape. Standard electrical tape glue won't stand up to the heat under the pan.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad