Dang, leaking buddy bottle (Air Venturi)

Picked up a used Air Venturi bottle from a fellow member and it has sprung a leak. I'm sure this fellow didn't know about it and it very well could have happened in the weeks since I picked it up. 
Filled to ~4500 a few days ago and it leaked down to ~3000. It was warm after filling, but not -1500psi warm. Just refilled it and shot some window cleaner on it. Sure enough little bubbles are forming right where the brass meets the black. 
Does anyone have any contact info for Air Venturi? I'd like to have a chat with them about getting this fixed. 
​Thanks,
Tom