Leaking Rear Brake Wheel Cylinder At 9250 Miles

[VRSCA1]

Anyone else seeing leaky rear brake wheel cylinders yet? I was doing my second LOF today with a tire rotation,pulled the rear drums to clean and adjust the rear brakes and much to my dismay I discovered the RR wheel cylinder leaking brake fluid,not real bad yet...the LR was dry.I hate going back to the dealer for anything...I just might do it myself if the wheel cylinder is not that expensive or submit for reimbursement of part expense from GM.When I worked at the dealer I used to see all the Venture vans do this changed them by the bushels,just wondering if anyone else is seeing early failures with wheel cylinders I have a 2009 GMC Sierra.

[bluArrow]

I would have the dealer do it as this is a warranty issue. GM needs to see the defective parts to establish if there is a pattern or if this is a "one-off".