Suzuki Bandit 600 (1997) Oil Cooler Leaks!!?

Help! Where the pipes from the engine join the radiator seem to be leaking ( inlet and outlet I'm guessing ), not massive amounts but enough to worry me. Does anyone know if its just two seals, gaskets that have gone and do i have to drain the whole engine oil to replace the seals, gaskets?? I hope this isn't to daft to make sense! Thanks