Door opener button (external)

[GG33]

Anyone know how to replace said item? The internal button on my Tamora works firn, but the button under the mi=rror stopped working yesterday. Everything else works fine and I tried re-setting by arming disarming ther alarm - no joy.

I think the button may have failed.

Has anyone replaced one? What's involved? (tried a search but no luck there either)

Many thanks

GG