HELP: Function button stuck

Got really confused today when I was jammin on my MD. It turned out the FUNCTION button somehow got stuck. The unit acts as if the button is constantly held down.

When I turn the unit off and on again, I get to the menu where you can choose factory resets etc. As this menu is accessed by holding down the FUNC button upon startup, it is pretty clear that the FUNCTION-button is stuck.

Anyone have experience wit fixing this kind of issue? Also on other elektron units?

I’m pretty sure that the unit is out of warranty, and if it’s an easy fix I might try to do it myself.

Several examples:

https://www.google.ca/search?q=site:elektronauts.com+function+button+stuck&ie=utf-8&oe=utf-8&gws_rd=cr&ei=13ymVpqmC8WnjgSMtraADA