Which is most common cooler or lines leak... Bandit 1200

[BikeJake]

I've got a replacement, for 85 quid from motorcycle parts warehouse

Let's hope it doesn't turn into a consumeable. 

Comment - Suzuki Performance Parts.... Don't seem to want to sell me the one for one replacement, seemed very latent about telling me about it.. Mmmm.. Told me to call back another time to get the availability of the replacement part? Get the feeling he thinks my project is a time waster