I just picked up a '88 300E about a week ago and it had these funky controls that on the inside of the seat in between the center console and the seat on both the passenger and drivers side. The vacuum supply pump is dead on the car which is what led to my investigation of the problem. It has an outlet on the pump with the usual tee and two yellow vacuum lines coming off of it but it also had another outlet with 3 grey vacuum lines coming off of it. I have to assume those 3 lines are for the orthopedic bladder features in the seat? Correct me if I am wrong. Now my issue is locating one of these pumps so that I can have central locking again and to check out the orthopedic seats. If you can correct me or provide any additional information or even confirm what I have found is correct then it would be greatly appreciated, thanks.

Connor