I've got a Lopi 520 stove that needs glass, gasket, and blower motors... all of which are available. But I can't figure out how the blower housing comes off. This is a 48000 serial number, with two damper controls one above the other under the ash tray. The twin blowers are in a cover that has no apparent screws, nuts, or brackets that hold it in place. Prying gently doesn't move it. Any idea how this thing comes off?