We are trying to replace the rusted evaporator coil cover in the freezer. Got all of the screws out on the face of the old cover, but there are four more rivets along the top edge, only a few inches from the roof of the freezer, that we can't reach with a screw driver. There is just not enough space for a hand holding a screwdriver. Is there a special tool required to "pop" these? There were no replacement rivets in the new cover kit that we got. How do we replace them once we get them off? Thanks. (Model number ZIC36NABLH) GE Monogram