Matrix reverse light always on

Hi
My crtd matrix reverse lights are always on
the garage have tried changing the switch which worked for a while
but they have come on again

i have had a look but it look like two switches are on the gearbox
has anyone got a diagram of which is the correct switch
They say the switch is fine so it must be the wiring but i am not sure they have changed the correct switch
I have tried to find the workshop manual for it but its a 2006 but cannot find on


Thanks