slk 230 compressor year 1997

Hello, dear slk , driver, since 2018 I have gained a slk 230 built year 1997 with no rust and very good condition, unfortunately I have a problem this year. After starting the ASR / BAS lamp goes off and after a few kilometers when the engine is warm and I times over 3000 u on the gas step the engine starts to jerk and ASR / BAS lamp lights up and the engine runs in the emergency program. Since I have read on the internet, a colleague had about the same problem. And with the construction il, where the many relays are ( front left ) was a “cold soldering point”. So I disconnected the battery and removed the component and see there a small burnt place on the board. So I then got a complete component at ebay, and built in, of course, looked before, the board is ok with the result that I come now even up to 4000 u. and then the jerking and ASR – BAS approach. one can emein if I get another component, it is the engine multiple The magnetic coupling can be easily rotated without ignition, I make the ignition attracts the magnetic coupling. What now, maybe someone has an idea, many thanks in advance, I try to upload a picture of the defective component, maybe has or someone has a similar problem. Thank you