Just finished having a rather expensive but interesting electrical problem. The lights wouldn't work when the doors were opened so the garage changed the sensors, that failed to fix the problem completely and cost nearly $850.. turns out that hidden in the back under the insulation is another box of tricks which has a circuit board and an air pump - the pump is for the air locks on the doors.
Anyway someone forgot to leave the drain open at the base of the bodywork.. so over time the well filled with water until it shorted the circuit board.. another $650 fixed the problem, well there is one problem left the fog lights dont come on in the dark for the ten seconds they used to...