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You could do an at home cleaning with a QHR, but leave the slide in and see where water is coming out.

Another way to do a leak test at home is to take a roll of paper towels and put them in a plastic bag (garbage bag or shopping bag) and shove it down the bell. Then blow into the lead-pipe to see where or if the horn is leaking. Cost = 0$.

I use a rubber ball in the bell, and fill an appropriately sized tub with water while blowing down the leadpipe... Works well.

Rick F wrote:Another way to do a leak test at home is to take a roll of paper towels and put them in a plastic bag (garbage bag or shopping bag) and shove it down the bell. Then blow into the lead-pipe to see where or if the horn is leaking. Cost = 0$.

Whoa...

...free paper towels!