Hi,
My car is currently at Lexus Coventry, looks like a HG job, coolant sprayed over engine etc. The car is nearly 8 year old (2007), but only has 74000 miles on it. Fortunately (I hope!), I purchased the Lexus extended warranty in Dec 2014,
I've had the VSC issue (DPF changed under warranty) recently had a water pump replaced under warranty (the symptoms looked to be the same i.e. coolant sprayed over the engine), and was sort of expecting this issue to crop up. I bought the car under the used approved scheme from Lexus Bolton with 30k miles on it, first three service stamps were from an independent, but I have had it maintained by Lexus since I have owned it. There should be no grounds for Lexus to challenge paying the bill, I'll keep the forum posted with my experience.