I have a switching unit that uses a remote control button to turn it on and off. I use the unit to turn on and off the power that operates a garage door. The remote has the name "HEATH COMPANY, BOWLING GREEN KY 42102-9004 MODEL: SL-6134." This remote control needs replacement. How do I do this ? Thanks. LEN PAULSEN Lenpaulsen@gmail.com. Tel: 615-447-7656