(This is the lower edge of the matrix as it's installed)

I'm assuming that the pink stuff is solidified coolant?
Can that be anything other than a leaking heater matrix/radiator ??
Symptoms were a smell of coolant when heater was on, so I was pretty convinced that it was a leaking matrix but was hoping it was just a leaking pipe/loose connector but now .......
Anyone got any other options that it could be before I fork out for a new matrix??