Passenger Door mirror button.

[T66ORA]

If you press the button to release the passenger door, you get nothing. Its not the "lock" button,i`ve tried that and it works on the boot and drivers side door. The passenger electric window only goes down 3/4 also.
I`m not sure if its two separate problems or they are related.
What would you check first?
Thanks Tony

[T66ORA]

Door opens from inside no problem. Suspect the button, but not sure how to access it?

The door ECUS are they in the passenger footwell or under the centre console?