Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, when attempting to eject the loading tray (pressing OPEN/CLOSE), is there a whirring sound and/or vibration felt top of the Yamaha?
Then it would appear to be aninternal hardware issue.
Are you then considering a DIY (do-it-yourself) repair approach? ...or more particularly, would you be comfortable working with the internal mechanism?
The whirring sound would be indicative that the tray/table loading motor is operational.
Which then leaves the gearing system as the most likely suspect.
In some instances, dried lubricant may be responsible for the gears getting stuck and/or unable to rotate smoothly.
Please post back clear pictures when the inner mechanism have been exposed. Click HERE.
Appreciate the post back.
The loading/unloading gears/mechanism would be underneath the tray/table.
Please click HERE to serve as reference.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.
To my recollection, yes; all gears are level/parallel to the deck. Please see Fig. 3 if that is the gear ass'y bring referred to.
Glad that the above information may serve your purpose.
...and Happy Holidays!