I recently bought a house and when I moved in I found that the previous owners had NOT left the remotes for the garage door. I've bought a "clicker" - a remote that you can program to your opener but there's one thing I can't figure out. Does my opener have "Code Switches"? It is about 11 years old and if it helps the model numbr is 139.53615SR. If there ARE code switches where are they? Thanks in advance for your help!! Amy :o)