FWIW - I used a 3 foot piece of garden hose to find where an idler bearing whine was coming from on the wife's Buick a while back. Read about it on some auto repair thread, was hesitant at first but sure as sh*t, it really worked well.
Hold one end next to your ear and put the other end at your suspect locations, if they are the same sound those are probably not leaking, the leaker will be pretty obvious I bet with the hose.
Good Luck - Let us know how it goes.
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