That somehow does not compute. In 93/94 the trunk handle was re routed to the "close assist" pump in a service bulletin. The whole upper actuator was replaced, a microswitch on that was bypassed, and a "t" was put in the line of the "close assist". I assume the port was capped, previously the "draw in" of the handle was handled by the "locking pump" under the rear passenger seat. That pump handles lock/unlock, lumbars, HVAC backup vacuum, rods if you got them, and vacuuum headrests if you got them, and of course the handle prior to the mod, and I think in later models (95?) controlled the trunk remote release.
I would suggest getting the 140 DVD (92-99) from Mercedes if you plan on working on the car. it is good not great but has wiring and service info $150 or so.