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I wouldn't feel that obligated if I were you, but as has been stated, I'd offer them a drink or something.
My tipping rule: If I'm in doubt, I tip. That extra few bucks isn't going to break me, and I'd rather over tip than be the "cheap bastard" whose foods gets spit in, or valeted car gets a little scratch, or whatever. In the case of a maintenance/service person, it might actually mean a little more attention to detail.
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it's all about self-indulgence
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