Using Star/DAS you can access the service history for a vehicle by accessing the ASSYST PLUS system. You get a record of every service done which includes the following information for each entry:
Day cycle counter: 249 Days
Kilometer reading: 17169 km
Mileage of basic maintenance item: 17169 km
Workshop code: 505
Operations performed: - Service 1 - Service 3
This is the first entry for a 2007 S550 I recently purchased that was serviced every 13,000 miles for the last 10 years.
Who knows what these service numbers refer to?