So, we've finally had an issue with the 2017 JKU Sport S we bought over 2 years ago - the passenger side rear door appears to be stuck in the closed/locked condition. pressing the unlock button will unlock all the doors EXCEPT the passenger rear door, and pulling on the handle on the door does nothing. Any ideas on what might be causing this? I'm thinking it's probably the locking mechanism, probably the motor or other electronics. Is it something that can be fixed at home, or am I better off letting the dealer handle it?