e430 gear shifter sticking
 

Ok so here we go.
operation is normal but today when the level is put to D, took more than normal force and then the triptronic wouldnt work cause it seemed like something was getting stunk and not lettting the lever move about. I tried going to park and then D a couple of times and half of the times it was ok the other half it would get sticky when the lever was in D. its a 00 e430
question: is it the bushings ? doesnt seem lose, or is it the piece of black plastic that folds when we move the level not letting small coins etc drop inside ? not so sure so i figured i'll ask before i take it to the dealer :)
thnx in advance.