My power lock quit. Gotta unlock all of them manually now. All the MB guys around here tell me they are vacume but i cannot find any vacume lines in the doors at all. All i see is 3 wires going to the lock solinoid. No vacume lines. It is an 81 126 body. Any ideas???

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2003 Ford Crew Cab 6.0 Powerstroke Diesel 6 spd 4x4(For Sale)

1981 MB 300SD 190,000 miles Gray with cream interior.(sold)
1981 MB 300SD 239,000 miles Cream with Brown interior.(sold)