I've got a problem I'd like get some information on before I take my car to the shop for costly repairs.

I've got a 1992 190E 2.6 that is leaking coolant from an outlet next to the transmission. (underneath, sandwiched between the transmission and transmission hump)

It's not a bad leak, but I have to top the overflow 2 or 3 times a week. I've noticed that the overflow spilloff goes down into the passengers side fender, so I don't think it's coming from there. (I could be wrong).

What are the possible components causing my leak?