Except for one caveat, it is fairly simple to replace. Detach the air hose, and unscrew for bolts that hold it in place and "unplug" it. The unplugging part is the caveat. The caveat is the cable *might be* routed behind the starter. The plug/connector on the end of the cable is too big to pull through behind the starter. On my S70 I needed to remove the back starter bracket to get the cable out. In order to get enough room to do this I also needed to remove the electric fan and fan shroud. If you are already on your second ETM then the cable may already be routed in front of the starter instead of behind it. If this is the case, count your blessings.

-Bruce