Remove Navigation DVD ROM from A6 Avant

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I hope you knowledgable people can help me.
This relates to my 2007 A6 3.0 TDi Sline Avant Quattro - 'high' MMI.
My sat-nav has stopped working as the boot mounted navigation rom will not read the original disc - it worked fine for years but I think some damp has got in whilst on a very wet holiday this summer!
I want to take the unit out and allow it dry out fully (if that's the problem) but I cannot get it out nor fully release the cradle/rack holding it.
I have removed 3 nuts - 1 bottom front + 2 high on the rack - it will wiggle around a bit but will not come out.
I can get the DVD ROM unit out half-way but the cables are tight - maybe I can add more pressure but I do not want to damage anything.
Any help in would be appreciated. I have spent 10+ hours trawling the web and cannot find this info.
many thanks in anticipation.
A6 sat-nav DVD ROM.jpg

The unit is at the bottom and 1/3 removed. i can just about get my hand behind the LHS but cannot access the RHS at all.