The reason why repair manuals don't exist for new products has to do with the way a technician is trained to perform a replacement or repair. They typically will have a laptop or tablet that has a smart query system where they input the problem into the software, and the software tells the tech what to look at, and steps the tech through the procedure.

I know this is the case because of a modern computerized washing machine we bought recently -- one the developed problems while under warranty. I watched as the tech consulted his lap top time and again, trying to determine the problem with our washing machine. Incidentally, he replaced major circuit boards, which still didn't correct the problem and finally they agreed to take it away and we bought a more traditional model with knobs you turn rather than having a computerized interface.

Anyway, no books anymore for the tech. It's all computer software.