That looks like Air Conditioning Fluid leaking from the Receiver/Dryer unit that's attached to the side of the Condenser. It has 2 pipes attached to the top, they have o-rings that can perish. I literally just replaced the seals on mine this week and the stuff that come out was the same yellowish colour as in your image.
Sorry for the resurrection of this. 189 appears to be suffering the same leak. Are these pipes pressurised at all? I will order the O rings and try stop the leak.