Wow, please come back to let us know when you find it.
I am curious now, does it work? Meaning have you tried to test the remote switch? Maybe disconnect the chassis battery to see if genny starts.
I have a SOB but slide controller is where one would NEVER see unless you knew where to look. I think it was done to protect it because it is in a lower storage bay. You have to remove a metal cover to get to. But I have never had to (knock on wood
I like my Magnum Energy Inverter but I do not think I would like their manual switch AGS system. I put a Onan EC-30 system in mine and it is absolutely perfect. The newer one are wireless and connect to your phone, but I want the controller on my wall anyway.