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Marc:
The red square button on the top of the dipstick tube cap is a breakable lock that holds the cap on. If it is broken off to remove the cap, the lock should be replaced. I believe the new ones are black instead of the original red color.
I too would say the fluid level is a good place to start, however one has to ask themselves where the fluid is going, know what I mean?
No stick is provided. One thing to remember is that the fluid used is a special fluid that you buy from MB. It is a synthetic fluid made by Shell in Germany. It's around $15/liter. I believe MB was afraid that shops would begin changing the oil to non-synthetic types, and that may be the reason behind a lock and no dipstick. The dipstick is available as a special tool. The checking procedure is very specific though, it is supposed to be checked at 80 degrees C. The temp is monitored via the MB shop diagnosis computer (SDS). It may also be a good idea to see if there are any trouble codes in the transmission computer that may explain the problem with your downshifts.
Gilly
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