Firstly, where is it leaking from? If its from the gasket seals around the water pump body, you can use rtv sealant to re-seal the water pump.
However, if it leaks from the pulley bearing, I'm afraid you will have to change the entire pump.
Hey sifu-sifu, anybody has a reputable evo x tuner to recommend? Looking for someone who is able to tune the stock Evo X ECU, not standalone ECU. Thank you lots!!