Leisure HJA6100 Fridge Freezer?

We have a Leisure HJA6100 Fridge Freezer and have a noise at the back of the freezer compartment which is either the fan or the condenser, attempting to take the panel of came up against a problem,, the Icemaker came out easily enough but the back panel seams to have a way to take out!!! We have undone the screw to the top panel and the one at the bottom where the vent is but the panel doesn't want to come out. For fear of breaking it we are asking the question is there a sequence of taking the 2 Panels out??? Can you help please.....