Good morning all, happy Easter break. I recently acquired of 2007 307 2.0 petrol, I think it is a ew10 rfc motor. It has appears to have a coolant leak from the welsh plugs in the cylinder head. When I remove the coil packs there is coolant in the valley of the head. It starts and runs nice. My question is can they be replaced in the vehicle or is it motor out. Any help would be appreciated. Thanks Brendan