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"

Got some news, some good, some questionable.

So I decided to fiddle with that rear door today. Lock button goes up/down as it it supposed to when I lock the car using the driver's door lock button. Door would not open from the outside. I didn't think it would open from the inside either, but today I climbed in the backseat and gave it another try. There was some pretty strong resistance on the inside door handle and as I pulled on it, I also pushed against the door and it popped open. So now that door will open from either the inside or outside easily whether the doors are locked or not. Even when the lock button on that door is down, the door is not locked. The button however does go up/down as it should when locking the car. So do you think this points to a vacuum or a linkage issue? The door panel has not been removed yet, but at least now I can do that since the door opens.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

Do you have a Mity Vac (or the like)? Its pretty much a necessary tool if you plan to keep the car or do any basic work. Harbor Freight has them at a good price. When you remove the door panel, after checking the linkage, you can remove the vac. pod or maybe unplug the lines and check it in place using your lungs if need be.

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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"

I think you are past the mity-vac stage in diagnosis. What you are saying indicates that either the lock linkage is broken or the lock itself is malfunctioning.

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'79 240D