No common to have the two recieves
The fobs are probably added as hardware then in the engineer menu so without that you won't be able to correct the issue , meaning you need the engineers code
It's worthwhile paying someone local to sort out and check the whole system over, in this DIY world everything unfortunately into always DIY , not having a dig of course
As someone mentioned in another post these risky risco you need product knowledge to sort problems out , i hate them personally and normally guess my way round fixing issues , so etimes with help from the local monkies