I just bought a 2011 SE, and it was the floor model. Assuming it was the floor model its whole life, it may have had its rear tailgate open for most of its life.
I don't know if this is true of everyone's Routan, but when closing the rear tailgate I need to be somewhat forceful in order for the door switch to register the door as being fully closed. Otherwise, I get the "gate" warning on the dash and the cabin lighting remains illuminated.
About one in four proper closings of the tailgate result in my interior tailgate light popping out of its receptacle. The last time I pushed the light in, I pushed the four little plastic hooks out a little bit and hopefully that helps. But it seems that the light fixture is just a little loose in its receptacle. It seems like it needs a rubber gasket or something.
Does anybody else have a loose tailgate light? Not necessarily popping out, but just being able to push it around a little with your hand? Does anybody know if there should be a little rubber or foam ring around the inside surface of the light?