SeanSF,
Boy, west coast MB dealer is treating you nice to do the bulb for free. Out east, pushing service is the way it is. What is free is the charging and for all customers a car wash.
In any case, I have two older MB cars and take them to an old fashioned mechanic who specializes in German cars. His hourly rate is half that of the dealer, he gets parts from the dealer, and is an authorized MB mechanic. Recommend you find one of those shops for out of warranty work. Based on another post, to protect against a big failure, if I buy the car at the end of lease term, will definitely look into an extended warranty.