First you need a good shot of dish detergent in a cup of water and start dripping it on spots that could leak. Use some sort of a dropper or bottle. Once you find the leak an o-ring swap should be easy.
Can you tell from where? It may or may not be obvious but I'd hate to see you dive in to something unfamiliar, even with 'internet help'. Would also hate to see you have to ship it if something simple.
It happens. My brand new Thomas developed a leak in the first few weeks. Sent it back to Mike and he fixed her up nice. Hasn't give me a bit of trouble since, and that was over two years ago. Love that gun