You used genuine?? If it's the Castrol version that's why mine started to weep.. Also killed my float level sensor in the header tank. I use nulon now.
From memory, drain coolant, the front wheel comes off, the heat sheilds, hose gets disconnected at the other end. 2x 6mm bolts with 10mm heads. 1 hard to get at. Then it pulls out.. After half an hour or shaking it comes out.
Reverse process to put it back.. Although quicker.

