There is special dye that you can buy that is visible with a UV light. This might be the easiest way to determine if you are having trouble.

But I agree with the above -- That is the most common place. Same place as mine.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k