C9 Aftercooler Service

Hi all – about to remove and service a pair of c9 Aftercoolers. 


1.  Any particular tips/things to look out for when removing?

2.  Is there a maintenance kit we can buy from cat which contains the necessary o rings and gaskets?  I've been quoted a very expensive price but that part # was for a kit which also contained a new aftercooler core which hopefully! I won't need.  They were serviced 3 years ago by previous owner.


Thanks in advance.