coolant loss into the cab

As title says really the passenger side foot well is sometimes soaking wet but my first thought were that is was the sun roof how ever there was some plan white paper on the floor and it has turn'd a pinky color which looks like coolant so could the heater pipes be leaking ? and if so how do i check or does the full dash need to come out? and is there any other pipes in the cab apart from the heater pipes?

cheers
saul