2015 Chic C-Line exterior habitation door handle not working

Dec 23, 2014
1,673
1,887
South Somerset
Funster No
34,546
MH
Carthago C-Line I 50
Exp
Since 2009
2015 Chic C Line. External hab door handle/lever has stopped engaging with the internal mechanism. Internal lever working okay but unable to open door from outside with either the fob or handle. Southdowns seem to recognise the problem and have said £100 for parts and £50 for labour although they have not seen it. Unfortunately they can't do anything for nearly two months.

I would like to remove the internal door panel so that I can see what the problem is but could do with advice on how to do it.
 
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