Lezyne pump defective check valve?

Hello all,
I've had a Lezyne micro floor drive HP since November. Probably used it 10 or 15 times at most. This morning I was using it to inflate an inner for a friend when I was suddenly unable to pump air out, although I could draw it in. I've removed the hose and this is fine, I've also removed the top handle and can see no damage within the tube. It would seem the check valve is defective.
Is this diagnosis correct and is there a way to fix it? Many thanks for any help!
I've had a Lezyne micro floor drive HP since November. Probably used it 10 or 15 times at most. This morning I was using it to inflate an inner for a friend when I was suddenly unable to pump air out, although I could draw it in. I've removed the hose and this is fine, I've also removed the top handle and can see no damage within the tube. It would seem the check valve is defective.
Is this diagnosis correct and is there a way to fix it? Many thanks for any help!
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I'm doubting that a brand new pump will fail that quickly. Although it is possible. I'm guessing operator error. Key word "guessing". If you're not sure what's happening(and it's your pump) it's pretty hard for anyone else to know much of anything.