Just to clarify heater matrix?

[Dodgy Bob]

So last week did a coolant flush and boy did it need it, all was good until yesterday. Footwell carpets are damp both sides and it's pink so it's deffo coolant, found some drips down the boot that goes over the steering column. Is there any other thing it could be? Obv I'm just trying to avoid removing the whole dash but everything in the engine bay looks dry-ish. I'd rather not rad weld my new coolant is there anything else I can check or anywhere else I can look before ripping out the dash?