I've had the same problem with condensation in the Nav unit, dealer didn't even look at it, and was already aware. However they ordered it a month or so ago which was when I serviced my car, it apparently STILL hasn't arrived due to some issues with the supplier only providing them one at a time? Which I find quite ridiculous. Also I was told that I was one of the first to notice the problem and my screen should be in within the next 2 weeks from that date. It is now well over a month past that and I keep getting different information from the Service Department.
Further to my rant, I had an issue with the rubber seal in the suspension, which would cause it to creak when I turned the steering wheel left and right when stationary, they apparently fixed that in my last service, however a few days later I noticed a knocking noise coming from the suspension, so obviously the dealer is at fault I believe as they were playing around with that section of my car. I was told the lower left control arm is causing the knocking noise and they'll have to order the part in. They weren't the slightest bit sympathetic toward me, when I had stated that they had replaced the rubber seal, which would have most likely caused the issue IMO, when I had called them up to inquire about it, they said they were heavily booked and didn't have time to see me for 2-3 days.
I definitely won't be taking my car back there for a service.