citroen saxo open scandal electric roof?

my Saxo 'open scandal' electric roof only drives open/ close on one side [drivers side], and the near side just trails back and forward and jams, plus it will not close tight. This is obviously wrong but I don't know the workings of it, or how to strip it down and find out what's wrong with it. A schematic would be helpful but can not find one - any ideas?