What do you mean by "more correct"? I can tell you that 2, 6 and 7 are entirely incorrect; 3, 4, 5, 8 and 9 are unnatural. #1 is the only one you are likely to hear but even then it is a rather strange sentence. By "serviceman" do you mean "mechanic"? "Serviceman" to me means a soldier, sailor or airman (ie a man who is currently serving in the armed forces).

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