When you move something that has sat for a while in one spot it’s feels often that it was stuck down which may be the case with the fridge and needs a bit of persuasion.
According to my book for models RM 4230 & 4231 you’ve done right and removed the door [to gain space] and 4 securing screws [2 each side] from the sides of the fridge and there doesn’t seem to be any other securing points. But have you disconnected the gas pipe. Checked behind the gas vent outside to see if the flue is fixed to any part of the housing it’s in.
Bob
April 2010