So as per pictures. Basically one drop of D5 right there. Twist knob slowly at first and it'll just wick down the shaft. Then twist the knob in alternate directions for a few mins afterwards, but don't press the button. Go make a coffee. It'll be back working perfect, albeit with a different feel. It only seems to last a few days though, and you have to do it again.
https://imgur.com/a/9cQPmJK