The service time for both the gearbox and differential oil is 30,000 miles or 3 years, if I recall correctly. Thus, when it was completed at Beaconsfield Mercedes in November 2023, with the vehicle having 30,500 miles at that time, it was the first occurrence.
Nonetheless, I would assert that the visit constituted out-of-band labour conducted at the behest of the individual from whom I purchased the vehicle. The involvement of an authorised dealer in the repair, which is documented, makes it perplexing that Mercedes would want to repeat the process. However, if they are unable to claim for the first B service I had last month, it seems logical that they would want a repeat service.
I am not expressing dissatisfaction; it incurs no cost to me. I am receiving a vehicle for the day, and my only obligation is to transport the automobile to and from the dealer, a distance of seven miles each way. I am more perplexed than anything else!