Just went out to the garage and took a look at the old pump. The only other place yours could be leaking--other than the seals you can replace without taking off the whole pump--would be where the small rubber supply hose enters the top of the pump or the fitting on the top of the pump that the supply hose goes into (see third picture between pump and reservoir). It doesn't look like the fitting would be the culprit. It's secured with Torx bolts. Are you sure you want to take the whole pump off?

You could have the front part of the pump off in 30 minutes.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles