Opening up an ADVC300

[boney]

I need to get inside my ADVC300 to repair/replace the fan but I'm having trouble in getting it apart.
I have removed all the screws but one side of the unit remains stuck together and I'm afraid to apply any more force in case I break something.

Am I missing something? Is there a special technique?

[boney]

No worries, I managed to do it