Humm, You might try appealing vacuum to the lines found under the p/s side carpet next to the door. They are covered with a black plastic cover. One of those lines goes to the door you have the problem with. It wouldn't take long to put vacuum to each one of those lines and see if, when you hit the right one, that will unlock it. It could be strictly in the linkage but I would try the vacuum approach first. If that fails maybe a visit to your friendly locksmith, the guy you would call if you locked the keys in the car.

What happens when you pull up on the inside lock button? wont budge, or comes up easy but nothing opens?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"