[cctalk] Tips on VME board access

Hi all, I have a Sun 3/110 with a faulty video section (hangs at boot when it polls the FB) and I want to be able to probe and troubleshoot the board. Does anyone have any tips on how to get at it since it's buried in the VME chassis. I was thinking of having an extension card made but thought I'd ask here and see what others have done first. Any thoughts would be appreciated. Thanks -Kurt