a shy and retiring tweeter pod out of its little cosy home?
Ideas?

Generally B&O equipment is very good, although I've had a system that failed right out of the box (but was replaced w/n an hour).

As for the tweeter, obviously it could be jammed and pulling up on it may get it free. Unless you find a piece of FOD, that may only be a temp fix.

If the motor has failed (power, loose wire, etc), I don't see much choice than wait for replacement.

Good luck!

working again yesterday evening. First time round it popped up and then immediately went back in its hole.
A restart brought the little thing up where it stayed for my journey home.
I'll have to keep the cheese handy in future!