Anyways, i think the micro switch is fine but the rubber membrane covering the switch/handle assembly seems to be binding, so I gave it some trim and gave a few dabs of RTV so it does not fall off.
Having used the private lock, it feels like an emergency measure, inserting a key 45 degrees from below while not being able to see the lock itself is rather weird. (Maybe I'll get used to it).
So hopefully the switch doesn't give any more trouble.