1999 Ford Explorer Door Lock Problems

Average repair cost is 120 at 119 400 miles.
1999 ford explorer door lock problems. Ford explorer 1997 2000 door lock key cylinder pair tumbler 2 keys fits. The fuse is okay. 1999 ford explorer the doors lock become stuck neither opening with the key manually key code or remote from the inside or the outside. The 1999 ford explorer has 13 problems reported for door locks do not work.
There was no known event leading to the failure in either vehicle not operated under harsh conditions gravel roads etc. The power lock switch will only unlock the drivers door but will lock all doors. I have an 02 navigator that has a problem with the power locks. Both vehicles are operated as normal daily driver vehicles.
1 1999 ford explorer 2 door mine and 2000 ford explorer 4 door my brother s.