I am doing the annual cleaning if my Harman XXV Stove. It is not very hard but the directions say to remove the right rear panel to locate it. I did that as I had to do that in order to clean the fan unit and clean the chimney pipe. The problem is that I cannot locate the Feeder cover to vacuum the fines. The directions say that both rear panels have screws to remove the panels but only the right side has two screws. The left side has rivets and I cannot get the left rear panel off. Can anybody help?