The propane exhaust manifold is directly above the igniter and burner. one on each side of the oven and very difficult to get to. a Hobart tech fixed it the first time but it didn't last. I found that the "L" brackets were a little bowed and straghtened them out and retightened. even replacet the "L" brackets. I was thinking that the oven my have become a bit unlevel making the situation worse by directing the flame more toward the gasket area than straight up the manifold but it seems fairly level.