Ruddy2906

Hello All, I have a fault with the roof on my convertible. I operate the switch, the windows come down as they should, the roof starts to open but stops as soon as it is unlatched and go no further. I can drop the roof manually, close it manually, then the next time I operate the switch the roof will fully open and close once. I’m guessing a sensor fault but which one I do not know. Is anyone able to print me in the right direction please? TIA Ruddy