Replace 05 Volvo firewall airline/wiring pass thur

Hi guys. Can someone be kind enough to give me some tips on replacing the black plastic panel that let airlines and wires thur the firewall, which is next to the clutch master cylinder. The plastic developed some hairline crack and causing some air leak. I am at lost on how to remove the big data plug socket from it.

 

Exactly is MCFC. But how do I get it out. I don't just yank it out, I suppose.

Someone should have done this before cause I saw quite a few 05 and 06 with non-original updated new styled panal. I think its a common problem.

 

Please ignore the caption in the picture. It is just a picture I pull from the Internet.

Another view of the panel front and back from eBay
http://cgi.ebay.com/ebaymotors/07-Volvo-VNL-Firewall-Electric-Air-Junction-Block_W0QQcmdZViewItemQQ_trkparmsZalgoQ3dSIQ26itsQ3dIQ26ituQ3dUCIQ252BUAQ252BFICSQ26otnQ3d30Q26pmodQ3d110664060549Q26psQ3d50QQ_trksidZm263QQcategoryZ50466QQitemZ110670651845#ht_675wt_722



I don't have a picture of it in my own truck but I found a picture of it on the Internet. I suppose that could be a screw hidden in the center under the bunch of wires. I will have to wait until tomorrow to find out when I get back to my truck.

 

Problem solved. There is this small bolt under the wires.