03 Impala Interior Lights Out, Except front floor

What would be the first item to check if all but two interior lights, and trunk light, of my 03 Impala are dead?
The only two lights operating are the front floor, on each side.

I now know the TRK/ROOF BRP fuse (passenger side) was found blown, and new fuses blow instantly. Does wiring run from fuse block up the door post in front or center?
Any suggestions appreciated.

A short can occur anywhere in that circuit look for something in the liter sockets, then you will need a wiring diagram.