About 9 months ago I replaced the original KTM clutch slave cylinder (a known troublemaker) with a dual seal Oberon replacement unit. It worked fine until the last month when I realised that I need to 'pump up' the pressure with the leaver each time I get on. It also goes a bit soft after 10min or so of cruising, until the lever is worked a couple of times. There is no sign of an external leak and when I cracked it open and bled it there were no air bubbles and it seemed to be full to the brim with fluid. I'm thinking the only thing left is fluid getting past the piston seal in the cylinder while at rest overnight, but the manufacturer (who is trying to be helpful) has never experienced that kind of failure even after selling thousands of similar units. Before I rip it out and ship it back to the UK for a replacement is there anything else I can try?