From my understanding, the shift delay works by extending the bowden cable which results in higher shift points. The vacuum part of it just mechanically moves the cable position. So if the green line is not holding a vacuum then it is either the line or a rubber gasket or rubber diaphragm in the shift delay mechanism. It should be much like the vacuum pods in the heat/AC system. At worst, replacing the green line and the shift delay should fix it.
I just don't see how to get at that shift delay mechanism - there is no way to get your hand in there and no room to manuever a tool.
Does anyone have the shop manual technique for replacing that part?
95 E320