Pop the cover tabs up to access the screws to remove the cover of a PPC1, PPC2, PPC2+, PPC2-AF, PPC3, molbox1, VLPC, MPC1 or MPC1-D enclosure.
If your equipment is under warranty or covered by a Silver or Gold Care Plan contact Pressure or Flow Technical Support at the below link or by calling 877-355-3225 before opening equipment.