Saying load paper

Actually, you probably do not need a service person.

1. Turn machine off.
2. Remove toner assembly, not just bottle.
3. Unplug wire, and remove PCU. (right door must be open)
4. Remove the paper tray.
5 Turn the machine on its side.

You will be able to see, that it just snaps into place. Most likely one of the tabs broke off, but you can put a drop of super glue on it, and it will be fine. Make sure it has free up/down movement when installed before you glue it.

Then, make sure your guides in your paper tray are in there tracks. That is the most probable cause of your problem.