a) Complete a full check of all systems immediately.
b) Make a full list of any issues including your premium Burmester SurroundSound.
c) Do not attempt to make adjustments...it May void your warranty.
d) Make an appointment with your MB dealer based on the availability of a loaner vehicle.
e) Demonstrate Each issue with your service rep.
f ) Let the dealer make needed repairs and adjustments.
g) Once you are 100% confident that all repairs & adjustments have been made to your satisfaction...return the loaner keys to the dealer.