Can this frost free garden faucet leak be fixed?
I believe it was the bibb washer at the end of the stem. I ended up buying a repair kit and followed this video. https://youtu.be/JOsmL2XtyMw

The kit is a Wall Hydrant Complete Service Kit that I bought at Home Depot for $20. 
http://thd.co/1WcIbrP

It wasn't too bad. Hardest part was removing the rusted screw in front of the knob. I had to use some PB Blaster and a ratchet to grip the hex screw head. Once I got that off, I just followed the video. The faucet is drop free now!