jwthomas wrote: If it is a standard HB installation, there is a single piece of metal across the back of the unit on two studs screwed into the back of the unit. The bar is attached with a couple of small wing nuts. Take them off, pull the unit out, disconnect the connector and your done. Be careful not to knock off the A1 panel connector.jwtThe above is true, but to do all of that, you have to be a contortionist of sort just to get up under there.