It is an intercooler pump. The SRT has a know issue with them going bad. I am still using the original IC pump on mine with no problems. Anyway, it is nothing to be concerned about if you can halfway use a screwdriver and take a wheel off a car. A replacement pump that is of better quality that will not give you any future issues would cost around $150 if needed.No big deal.

Check to see if the battery is still the OEM original. It will be a white battery if original. Even with the low mileage, it needs to be replaced if original. These cars are very dependable for the most part. most any issue that comes up can be resolved by the fine members of this forum. The SRT was built on the SLK32 AMG platform, so it is a tested and true platform. You will enjoy it immensely. There is no other car that you can buy in this price range that gives you so much bang for the buck. Good luck with the purchase.