Wow.. looks like you have/had a wiring issue with the in-car docking sled.

I don't have a Mk2a unit opened up here right now, but I do have a Mk2 open --> the black/burned component at far left is a 1.2Kohm resistor in my Mk2, and the blown-away item was a 0-ohm resistor.

EDIT: MMmm.. in my Mk2, those four contacts (the two for each burnt part) are all earthed/grounded. Which, to me, suggests that the in-car wiring may have been wired backwards, trying to feed +12V through the ground wiring.. BOOM!

Cheers