I had a water leak at the house so I bought one of these to locate it. This thing is great to "look" inside your XS with your ears also. You can adj volume and pinpoint any noise, bearing or tapping, to just where it is comming from, hope it helps someone else also. Ok, before someone tells me how much cheaper there long extenion or screwdriver is, I have used both and there is no comparsion.
http://cgi.ebay.com/LEAK-DETECTOR-WA...item4cf053c4c9
http://cgi.ebay.com/LEAK-DETECTOR-WA...item4cf053c4c9
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