I recently replaced a DSS hydraulic brake light switch that had lasted over two years with another one but there has been an issue these pas few months of an unlikely (?) leak I might be wrong about. In the image you'll see the face of the switch is damp and the paint on the steering yoke damaged (again) I can't find a source of leakage from the thread at the hose union and is it possible this leak really is coming from the red face of the switch?