Just found that my deore m535 front caliper is leaking at one of the pistons. is there any way of removing the piston and trying to cure it?

If not, don’t suppose anyone has a spare going cheap!?

Possible that a bit of dirt has shifted the seal, may be worth taking it apart and cleaning it all(new seals not available), or just sending it back for warranty if it’s not that old.You can also swap it with just about any other Shimano caliper that’s being sold cheaply, as long as it has the same type of hose fitting/ mounting.

i think you can source new seals yourself if they are just o-rings. Someone posted some decent o-ring links a few weeks ago. I have used Supaseal in work in the past.