Plug that tyre...
First, figure out where the leakage is. Could be a faulty/broken valve. Use soapy water to find it.
But listen to me! I'm the tyre pro here. Plug it with the gooey stuff. If it fails, I'll buy you a new tyre. And no, you will not crash from a slow leakage. You will notice the poor handling once you start losing some air.
Don't listen to the others that fear the plugged tyre. I've been a tyre tech with race creds and a michelin cert. If you dropped your $500 helmet, would you buy a new one or put some touch up paint?