If it is still under warranty you might get away with that but otherwise I think you would have a great deal of difficulty pinning a costly clutch repair on them for failing to spot dodgy hydraulic fluid. Why not insist on them doing it right in the first place and avoid the hassle of recovery together with the motorhome being out of use while they try to fit you into their busy schedule. I would rather pay a bit extra and not have my holiday interrupted.Yes they are fiat pro, if they want to just check rather than replace that is their choice as if it goes pear shaped they will be getting it back off the low loader , with a stamp in the book for their own service they can argue amongst themselves