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FX Impact Leak Problem (how hard was to get it fixed guys)

My FX Impact started leaking today from the back around the regulator I'm the 2nd owner gun was working just fine and it came in good shape only modification I did was
remove the CC Bottle and go 3/4 counter clockwise to reduce the regulator presure I only shot under 70 yards and 20 punds is enough
anyways called AOA and they think is a O-ring that probably went bad

My questions is to those who had this issue before
how was the process to get it fixed ?
has it happen again ?
how much money you lost sending back to AOA? or for the whole process