Does the red light flash when pressing the keyfob buttons indicating that both switches are functional?
If you get yourself a copy of Toaf you can re-use a secondhand circuit board using Brian's (or was it Trevor's) hack. I recently did one for a local member. Spare circuit boards are usually available either new or secondhand on ebay.
eg:
https://www.ebay.co.uk/itm/1x-MG-ROV...cAAOSwJyVdBlh9
Regards