Super easy to get the facia of the radio/cd/HVAC off.
Just unclips.
Get one of those cans of compressed air from Jaycar.
Haven't got one apart before but I have pulled the series 2 apart. Mostly some small screws. A few delicate ribbon cables
Be careful, be gentle. Blow it out with the air.
Might be a good idea to pull the trim panels off the sides (no screws, just clips) and inspect the wiring. The wiring on drivers side sits close to the metal frame of the instrument pad assembly. Inspect for anything obvious.
I would expect the fault to be most likely in the facia.
They can be replaced as best I know (still trying to find out if the series two can be swapped with out reflashing the unit)
If the fault isn't with facia, and you need to replace the whole unit, then I'd be looking at one of the new 11" Android Kayhan units.
Replaces the lot with something that will introduce a screen that delivers functions seen on the newest cars.