Exccess to front marker lights wiring

Hi, I have non functioning front marker lights on a 2010 Autosleeper Devon. Initial investigation has found no supply to either light, an independent earth didn't produce any change. Rear marker lights work. Therefore the conclusion is a broken power supply to the lights. Problem is access.Is it a matter of removing the over head locker board to repair/replace the wiring? If so how please?

Sorry, Access.

You posted about this back in June, sorry you've not found the fault. If you put 'marker' in the search box,  top right, you'll get lots of threads on the subject, you'll need to find ones that apply to your type of coachbuilt but hopefully you'll find an answer.

Hi, yes Paulmold I did read the searches for marker lights but replies were centred around corroded connections etc. In truth the usual problem. I guess having exhausted those usual faults I'm left with either gain access to the cab overhang or replacing the wiring without too much collateral damage. Thankyou J C,