That is a lot of stuff to replace. Can I assume you are looking for the complete wiring harness in the cabinet or the harness from the door to the cabinet?
Not knowing exactly what 'replaced everything' means, and 'the back lighting comes on' I will assume you have at least one florescent lamp on and the machine does not power up.
That is an indication the power box, or power supply is not working. I would have started with the main power cable that goes to the motherboard - these are mentioned many times in the forum and I believe they are for sale in the classified ads. NOTE - the one in the picture was disconnected and turned around so you can see the burn mark on the plastic. This is a common problem with the S+. Sometimes just removing it and reinstalling will get something to happen ( with power off ), even just wiggling it with the power turned on will do something so you know that is a possible problem.
With it not powering up there is not a whole lot that needs to be replaced - I would use a volt meter to check a few places to see if the power from the transformer is getting to the motherboard, trying the suggestions above would be done if you don't have or use a meter.
Sounds to me you most likely have a problem with the power cable from the power box to the motherboard. Get power to the machine and then you can see what other problems you may or may not have. Sometimes 'replacing everything' will cause a couple things to not work depending on how that was done.
PM me if you would like.
Tony