2006 Mercedes Benz ML 500 transmission slips

Hello, These transmissions seem prone to electronic issues in higher mileage, and the best answer for electronic issues is diagnostic scanning. A professional technician can plug into the vehicle to examine and test various portions of the vehicle, including the transmission. If you are not ready to take it for diagnostics, the most basic thing you can do is scan for trouble codes, and see what the problem may be related to besides the transmission.