The Bose head has all sorts of different modules and amps. No idea if anyone has ever swapped one of these out. I would check the US site as they all got Bose over there in the QP. There may be more info on it there.
Don't do the lambda unless you are still under warranty. No one does those every 4 years. Take it yours is a 4 Yr major with carbon canister too? Some do those, some don't also.