[Land Yacht]

The heater under the credenza between the passenger seat and recliner is not working. I traced the blower hoses to the air conditioner compartment in the basement to a large black box, that I suspect is a blower. Is this connected to the AquaHot or does it have an electric heater inside? The exterior of the black box is thick with black soot. I am thinking it is old dried hydraulic fluid that was never cleaned after a leak. Does anyone know the make and model? If so, rebuild or buy new? (Pictures below)
Thanks
Mike