I pulled my Engel apart to fit a fan [turbo] on later models,
there is nothing under covers, I also fitted a led light that
worked via a mercury switch, I wired this to the dead side of the fuse,
best thing ever IMO, now STD in most new models,
Was approached by Engel when word got out.
The light I had designed had a self learning eccellerometer, brainy little light
could tell if stationary or moving, even if parked on an angle, powered by single AAA battery
never went ahead with it though, bummer