[Simple5]

So, I am pretty sure one of my door lock actuators is going out and I am not sure which one. One day when I went to lock the car the front driver side door locked but all the other doors did not. I had to use the key to get into the driver side door. A quick search of the forums directed me to a 15amp fuse in position 14.

I have replaced it once over the past few months. Which goes back to my question, how do I know which actuator is going out? I don't want to replace them all if I don't have to..