w123 Leg Room Flap Vacuum Question

[will_t]

First, the door locks an engine shut-off on my 84 sedan are 100%, and the car holds vacuum for days. The vacuum operated leg room flap element checks out - it holds vacuum and operates the flap when i pull vacuum on it with my hand pump. But the line from "the system" that pulls the actuator is pulling very very little. I put my tongue on the open line with the engine running and could feel faint vacuum pressure, but very faint. Can anyone tells me where I might go from there to try to get this thing sorted out?

Thanks,