Paging oldskewel... or anyone else with door lock actuator troubleshooting experience

[Bdc101]

https://xoutpost.com/bmw-sav-forums/...g-problem.html
https://xoutpost.com/bmw-sav-forums/...g-problem.html

I have been experiencing similar problems to these threads from oldskewel and Siddy1200. Here are my symptoms:
1. Keyless entry no longer works at all
2. Central locking button works for all four doors
3. Rear doors struggle to get the locks up and down. About 75% success rate
4. Putting the key in the door lock cylinder works fine and unlocks all the other doors properly.
5. In my Foxwell, I get no codes. In my PA Soft, I get the following codes for the ZKE module:
"Central Locking Mechanism Short Circuited" for both driver's and passenger's door
6. I checked the FZV unit in the hatch, and there are no physically broken wires which I can see.

I have tried to reinitialize the keys with no luck.

Today, based on the advice in these threads, I unplugged my driver's DLA and noticed that the rear door lock actuators no longer struggle to lock and unlock. They have a 100% success rate and work faster and sound better than normal.

I would like to ping the brain trust to see if this sounds like a bad DLA. Is there any reason to buy a used one off Ebay or should I just buy a new one? Would this possibly solve my remote unlocking problem as well? Any other suggestions?