TTT

ANyone have any ideas? I replaced the valve on the drivers's door. (by the way--the dealer says there is a new valve for that location--$51. I bought the old version for $18).
The unlock system won't hold vacuum so I know I have a leak there somewhere. But the locking side is still holding vacuum but non of the doors lock. Does anyone have any idea why this would be happening. They worked fine before the whole problem arose and they worked once when I pulled a vacuum on the locking hose on the driver's door switch. But now nothing happens either with a mity vac or with the system vacuum.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13