Drum Cylinder Leaking - Squeaking

[bitz767]

My breaks have started squeaking around 20k miles. It was bought in february. I took off the front pads and they look fine. When I put the parking break on and try to push the car, i notice a squeak coming from the right rear. This is where I hear the intermittent squeaking coming from. Yesterday I pulled the drums and every thing seemed fine to me except for the left side of the cylinder was wet and i wiped off fluid from it. It wasnt super thick, so im assuming its break fluid. The squeaking only happens after the car has been used for 10 minutes or so. The squeaking started off very quiet and now is getting louder.

Would this be covered under warranty? or would the leaking even cause the squeak?

Thanks