2000 S500 service mileage reset itself...
 

car was reporting service needed descending from 1800 miles, and when started car, the service reset itself to 9000miles... what happened and is there a service bulletin on this?

also, the car flooring lights are not working. is there a common failure on this car you guys know about?

battery seems to be dragging when cranking. possibly a weak starter, possibly a CCU issue on the battery. any known issues there?

Thanks all.
I'm collecting this car for service with a customer, and will fix all I can.