Dome Lamp fuse draining battery, possibly trunk light?

Ok ill pull the bulbs first and check for corrosion, but what if that doesn't solve anything? could it be either the trunk or gloe box lights? I cannot find a wire for the trunk light and just checked for where the wires come off the cigar lighter and it looks like the socket is completely removed.

Look man, stop "what iffin" already. Be positive. Don't worry about "what if" until you get there. You're clobberin things up.