Most time when this happens, there is a hardware issue where the connector is broken or not making good contact. Only thing you can do is remove tray 3 and during the removal look at the connection point at the bottom of tray 2 and the connection point on tray 3 to insure nothing is broken and also nothing is stuck in the connector which prevents contact from the other connector. If everything looks fine trace the connector wire on the inside of the printer to the dc controller to make sure it has not come loose. If you run a config page it should show all the options installed. If tray 3 is missing, then there is a hardware issue and you will probably need service. Sorry.
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