Gerald is correct. But I would like to add that prior to disconnecting the gas shocks, look up under the open door at the "C" channel. Depending on the size of the door, there will be one or two white blocks and one black block. The black one is used to keep the door centered, so it doesn't move left or right. The white ones keep the door from falling out of the channel when it is lifted higher than the gas shocks. There is one screw holding each block in place. I used a number one Phillips screwdriver as the screw head is very small.
