I got a call from the dealer today, telling me they made quite a lot of progress.
- the belt was lightly misaligned which they adjusted
- because it was a new bike, the belt stretched a little and picked up some slack which in turn increased the noise from the misalignment
- apparently a new firmware has been released, after it has been applied they took it out for a tests and didn't notice any of my reported symptoms anymore.
Since I already have a 1000km on it they're going to do the first maintenance tomorrow and by Saturday I should be able to pick it up.
I said 'should' because to be completely sure a zero technician will still have a look at the bike (remote control of a computer that's attached to the CAN-bus of the bike) to see if everything checks out.Here's to hoping