Have smelled coolant at various times and gotten rid of the over flow container and it's related systems of hoses, of leaks. I have a 2004 xjr.

Dealer pressure tested coolant system and said the leak was in the outlet tower that is somewhere below the aluminum portion of what one sees below the super charger.

Has anyone had this problem, and if so, how involved was it to take apart the supercharge or or it's component pieces to get to the block?

It seems there is a gasket, but mostly the job is labor.