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My buttons have to actually be pressed in. Perhaps thats why it was being sold? Contact neptune to see if it can be repaired?
Never unscrewed mine to se if it was a viable option. You are though, right at this point he no longer has a warrenty as it's a second hand item.If it were me, I'd unscrew the cover to dislodge the stuck buttons. Not sure if that would void the warranty, or if there even is any warranty since you bought it 2nd hand.