I have had a pair of these brakes for a good few years now and pretty nice they are too, but now on my daughter's bike. A recent bleed saw them come back to decent performance but there appears to be a bit of oil emerging around the rear brake lever, a bit of oily residue around the lever pivot and cam assembly. So I suspect it is weeping a bit. Is this fixable? Or can you get a new lever assembly (no joy with a fairly cursory google search). Or bin (which seems a waste as these were/are dent brakes without, as far I have experienced none of the wandering bite point subsequent models had.
Rear brake/left hand side. Silver colourway.
EDIT, or maybe just a new piston and seal assembly....
Infamous for lack of spares availability. Just stick a deore lever on, they are the same shape.