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First, your soft close actuator is probably failing. The gears strip out which cause that ratcheting sound.
They are not too hard to change out depending on your skill level. You have to remove the door panel, peel back the vapor barrier and work inside the door. The assembly is located near the door lock/latch. I simply unplugged the power connector for the actuator on my car for now. It doesn't cause any issues - the door just operates as if there was no soft close function.
As for finding the replacement part, you can use a website like Realoem to check part numbers or almost any online BMW parts store- compare part numbers for each door.
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