ROFL....it's hard enough getting MMC to replace the plastic with plastic. I wish you luck but fear your on your own with a replacement cost, it might be a loose hose clip but history says it's the rads that fail, problem is made worse by the outlets cracking if the hose clips are too tight...it's a no win situation and the only permanent fix as many of us have found out is a new aluminium radiator, Mulfab sell them and many dealers have experience of fitting although they are not hard to do as they come straight out the bottom.
