I am not sure but i beleive that the leak is just pressure in the low pressure chamber. If it is VERY faint, it is not a leak. My old spyder was the same way. It was not leaking, but i could hear the pressure inside the gun. IF it is a real leak, C02 cloud spraying out, you need a new o-ring or two. To put them on you simply unscrew the screw right beside your gas-thru grip. Then teh LPC, gront grip will all come off. Make sure you see what order everything is in. You will probably need a new o-ring on the tube that is attached to the front block(thing that LPC is attached to). Then just put it all back!
Hope that helps
