It may be worth seeing if all the pink is just beneath the expansion vessel. My car had a leak from the coolant sensor on the back of the block and it was quite impressive how far it seemed to spray over the hoses and components of the car but when I cleaned and dried everything and ran the car up to temperature I managed to trace all the pink but up to the highest point.
In another car a coolant leak turned out to be a spring clip on a coolant hose which had snapped on the back face so it looked okay but once the coolant was up to pressure it skooshed out all over the thermostat housing. Took me ages to work out it was coming from the hose not the housing itself.
Good luck.
Sent from my iPhone using Tapatalk