Sorry to hear about your window issues. Are both of the back ones out? I would go ahead and replace the fuses anyway, because I have heard that even though they look good, that they can still be bad. Hopefully this is the culprit with your LF and RR window. I do not think it would be broken wiring, especially since both stopped working, but I suppose it is possible.
Until the other day, my RF and LR windows were not working. I knew it could be the fuse, but I never got around to checking it until last week. Sure enough, it was the fuse. I installed a new one and the windows started working- well, at least the RF window. The LR one rolled down a little, but would not go back up.
. It was like something was catching. I was able to push it back up manually, then used the switch, then it secured it back in place. I am assuming something is wrong with that window mechanism.
. At least I still have three windows operating properly (for now)
, so I am not too concerned (for now).
Good luck. Let us know if you find out what it is.