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Hi. The fuse would likely not be the cause of the door ajar light. THey really need to catch it acting up. Have they replaced the switches in any of the other doors?
It sounds like the switches are only working ok when they have the vehicle. Have you tried lubing the door latches and seeing if that helps?
Let me check. Dont think there is a relay involved.
The door ajar inputs go to the interior fuse panel. Then the interior fuse panel, based on the input from the switch, will turn on the door ajar indicator in the cluster and the dome lamps. So if the switches and the latches are ok, there could be a wiring concern, such as a chaffed wire, or the interior fuse box maybe faulty.
If you had access to a good scanner to plug into the vehicle, that can view the door ajar switch status in the fuse panel, then you could isolate which door could be at fault.
Ok. Contact me tomorrow if you would like.