Will try the new belt and see if it stops the squeak. If not, will address the pulleys as you suggest. Thanks for that.
Also will clean the pulleys with a toothbrush and some carb cleaner before I put the new belt on. There seems to be a bit of gunky belt dressing on the pulleys.

shaman15, you can buy the new drive belt anywhere, but call the Parts Department at any MB dealer to find out the proper length belt for your vehicle.

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Fred Hoelzle

Having the dealer look up a part number so you can buy it at another store is poor form. Plus, . . .parts departments can see this type of customer a mile away and will not be helpful. ( nor do they need to be )

Build a good relationship with the parts guys and they will help you more than you realize.

Yes, didn't want to call a dealer for info if I was not going to purchase from him. Alldata lists the part number as 0109978392 but that seems to be a discontinued item. I assume it was changed at some point. Ordered belt from reputable auto parts place...a Contitech belt...sent them my vin and engine number and they say that is the belt for my vehicle.
#0119970692 is the number. Guess we will see.

shaman15, you could have ordered the drive belt from a MB dealer that sells parts at wholesale prices, and have the belt shipped to you. No need to drive 2 hours to your local MB dealer.

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Fred Hoelzle

Yes, hadn't really thought of that. Belt should arrive in a couple of days ..if it is not the right one I will return it and check out a dealer.