removing trim from cab roof of 2011 symbol

Has anyone dropped the trim from the roof of the cab of a 2011 Symbol?
I am putting in a new rear view camera and want to change the cable to the monitor on the  mirror.
What I need is a manual showing how the trim is held in place!

cheers
mike

If it is anything lke mine the cable to th emonitor is simply slipped under the edge of th etrim nearest the windscreen. Gentle probing into the join (actually a small gap on mine) may expose the cable, which then runs down the left side pillar.