I just purchased my 2004 C230 Kompressor with 135.000 miles. I could not find answers on the forum for my questions, but it may be my fault for not looking in the proper area. If that is the case please forgive my error. My first question is, should I have the Timing Chains replaced. No noise and car is in excellent shape with good service records. Second I inadvertently raised the rear sun shade and now it won't retract. Is there an easy way to lower it manually without breaking it. I'm not much of a mechanic. Any advice will be appreciated, Mike