Are you saying your flowmeter shows 5CFH anytime the valve is open? That's a pretty significant loss, and Everlast will likely ship you a replacement, so I'd contact them before opening the machine and risking voiding the warranty. If that's not what you meant:
The easiest way to prove a leak before (or through) the gas solenoid is to open the bottle, let the pressure stabilize for 15 seconds, close the bottle valve, and watch the needle on your regulator. It should not move for quite some time (no system is perfect, and it will eventually drift down, but you should get a good ten-15 minutes with no detectable change).
If it does drop, then a soap test of all external fittings and connections is in order, and one suspect spot in particular is where the valve handle enters the valve on the bottle. If you find a leak there, try opening the bottle valve fully, hard against the stop, and test again. (There is supposed to be a positive seal in that position, which is why all high-pressure bottles should be opened fully.)
An 80CF bottle will show pressure drop much faster than, say, a 280CF bottle, so if no leak can be proven, there are gas conservation measures you can take.