Help needed removing a power commander II

Hi guys,
My bike has started to run extremely rich recently and I thought I'd remove the power commander to ser if the problem is located there.

Buying the bike the PC was installed and the contact mating with the removed ecu contact was wrapped in plastic bags. Looking at the contact I thought it was some sort of homemade solution as of the wax used



Then I found this picture and figured out that this is actually how the pcII contact looks like.



BUT, I can't seem to separate it. As I am bit of low tech any hints on how to separate it is very much welcomed.

 

What I meen is, shall I just pull the ends apart or is it some hook to release. Looking at the second pic I would go for the latter but as said, I can't get it out...

 

Problem solved. When pulling out the ecu I found that the little hook should be pressed rather than lifted...