Once free you'll notice a small guide pin on the right side (from the front view) near the gears, manually rotate the gears (lowering the lens assembly) until the pin lines up on the far right side (there should be a guide track for it on the bottom of the tray).

Slide the tray back into place making sure the guide pin is properly aligned into the guide track.

You can do a partial reassembly to test the fix, but be careful as the power cord "key" is a molded part of the case, so it can be inserted upside down.