Habitation door lock advice (1 Viewer)

[Madcaravanner]

Our hab door lock is acting up it seems to have broken a little
it still locks
but when it is unlocked the barrel turns especially when you shut the door and can lock itself - Steph has locked herself out a few times on our last meander

SO
how does one take the door panel on the inside off to access the door barrel ??
What do I need to know/do

 

[Stealaway]

Which M/H model? What type of lock? Photo would be handy