DIY:
1. shut off the main
2. go to home depot, show the pic to shop assistant in the plumbing sector, buy materials (cutter,connector, fire) and check youtube, then you can diy
I have the same problem before. Yes, it's part of the frost-free faucet. Just repace the whole thing. Make sure you buy the same length one. And always remember to drain the water in it before winter.