The front passenger door will not stay locked. The lock stays down for a few seconds then pops up. When that door is then opened the alarm siren sounds. The drivers door will sometimes pop up after locking but is generally OK. Where do I start looking?

My right side (front and rear) position lights and license plate lights are out, and I get a position light failure on the dash. 10 amp Fuse #31 blows when I turn the lights on indicating an electrical short. Any known problem areas for this problem? Connectors I can unplug to help isolate?
Thanks