Probably needs no more than a clip . And parts are more than available . They're so unreliable that Baxi make a fortune out of them. I doubt very much they'll stop milking that cow any time soon.
However , if your "friend " is A) daft enough to pay for such a contract , and B) not willing to get a second opinion , then tough luck really.
However , if your "friend " is A) daft enough to pay for such a contract , and B) not willing to get a second opinion , then tough luck really.