This is an old thread. Maybe you have the answer to your problem..
My ash tray got stuck after my first use.
Got it removed and noticed the heat had deformed the stainless surface behind the ash tray was deflected upward by the heat. That flat section is the bottom of the fire pot. It gets a lot of heat.
the deflection prevented smooth removal of the tray unit.
The fix was the use a SMALL hammer and GENTLY lower the deformed surface down to it's original level.
This happened after the first 2 or 3 cooks and the same fix was applied.
Issue hasn't cropped up again since.
Easy fix...just be gentle.
Have you moved onto the auger jams and auger/hopper fires yet?