Shimano road disc caliper - leak past pistons

First.Aspect
First.Aspect Posts: 17,167
edited October 2015 in Workshop
I have an issue with my RS685 brakes (Shimano's road disc hydraulic). Brake fluid is leaking past the pistons in the caliper. My guess is that this is a warrantee return.

Before I dismantle, get covered in brake fluid and then pack off back to where it came from, does anyone know of a fix?

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