how to find snorkel leak.

Okay so ive got a 2013 sportsman 500 H.O with a snorkelyouratv snorkel kit. The kit has been installed for about 8 months or so now but its always been more of a precaution then a need. well, now i like going deep. I took it out and actually when deep enough to cover the air box and it never stalled out but after being in a hole for 30 seconds or so i checked the drain tube on the air box and it had about a 1/4 inch maybe a little more of water in it. so i took the air box lid off found a spot it was leaking siliconed it up and went back to testing. Its better but still leaking a little. Whats the best way to find the leak? Thanks!