Esoteric K-03 drawer problem

[accudude]

Recently, my esoteric K03 had been reluctant to open and close is drawer properly, sometimes sounding a little weak, sometimes not being able to open or close and show a "tray error" display. I opened it up to check on the belts (a ribbed long one for moving the tray and a small o ring for moving the disk up and down). Both seems fine. I went on to reposition the long belt such that it wouldn't always be folded at the same spot (the pulleys) at rest. After a couple more test runs, the motor for sliding the drawer no longer seems to be moving (the one for moving the disk up still does), and I'm currently left with a manual drawer. ( Thankfully, I can still load a disk and play)

Before getting the massive thing to service, is there anything else I should look at or try? Is there anything as a diagnostic reset that I can do like a computer?

Thanks.