PS5 Disc not reading

I have a customers PS5 in for repair, it will not read a disc for anything, and of course on my first ps5 I didn’t put in the disc correctly so I know now haha. I can put the disc in it will spin 2 times and stop, then the laser will move forward and backwards until it doesn’t read. Everything is perfect in the drive, the timing, the 2 motors, and I have even replaced the laser lens and deck just to be sure. I am stumped. I have also tried to do a reinstall and different discs.