Access to rear hatch door lock 2017 Titanium

[MyEscape]

Hi, was wondering whether any members can assist. Our hatch door lock doesn't open when we press the external button to open the hatch door, but the lock does unlock when we press the remote. So I'm thinking the solenoid for the lock must be working and perhaps it is something else. So I wanted to access the lock through the tailgate/hatch - does anyone know how I can remove the internal panels?