Sorry to mention that I owned a 2004 W209 CLK 240. It also developed a transmission problem - just out of the three year warranty period. MB wanted many thousands to LOOK at the transmission just to provide a quote to repair it.

After a W140,W210 and W209 (all bought new) I will not buy a modern era MB again. I have gone back to the "Age of Engineering" with a W124. ( not to say that it's the most reliable car - at least it's much cheaper to fix and I can do it myself)