leak behind intake manifold
 

On 2006 Ford escape hybrid, I seem to be leaking green fluid slow in back of my intake manifold but am unable to find source as of yet.I do plan on pressure testing coolant resivor... Is there any coolant lines or a/c lines behind the intake manifold that could be the problem. Is the intake manifold just plain plastic or is it a shell? I am just hoping its not a head gasket...