Have a client with a HP Laserjet 4000. Can't get it to print to Tray 2 by default. It will invariable try printing to Tray 3 or manual feed Tray1. I prevented it printing to tray 1 by going into configuration and switching tray 1 from letter to custom. Now it prints to tray 3 only. If I force it to print to tray 2, on the LCD screen it responds with an error 41.3 unexpected paper size. I just did a maintenance kit so all the key rollers have been changed. I double-checked the guides in the tray to make sure they were all snapped in correctly in the right dimensions. Does this mean there are faulty size-detection switches? Is there any way to know for sure?