Welcome to the club.
Which dealership are you going to?
The Lexus dealer will likely be very helpful but unfortunately Lexus UK will more than likely reject any claim of fault here and blame you / the previous owner for the delimitation both inside and outside.
I have had phone conversations with a representative from Lexus GB and they were very insulting, saying that I had used an abrasive cleaner on my interior and an air freshener had caused the delimitation. All BS, like most enthusiasts on here, my car is kept in immaculate order using only the best cleaning procedures.
I have been a Lexus costumer for over 11 years and this is highly unsatisfactory as they couldn’t care less.
Bristol Lexus are currently trying to see what they can do regarding my rear spoiler, so time will tell. If you don’t mind, I will forward your post to their Service Manager. The more reports of this, the better, as it’s clearly a manufacturing issue and nothing else. I’m happy for you to do the same. Please PM for further details if required.
Good luck and please keep us posted. Unfortunately to my knowledge, no member has been successful with this claim. I know there are at least half a dozen of us on here who have suffered with the interior delimitation and who have contacted Lexus UK, but Lexus were adamant that mine was the only case in the UK and didn’t think the multiple cases I pointed out to them in the USA were relevant.
This has greatly tarnished my experience as a long standing Lexus owner and enthusiast and will likely be looking elsewhere when our cars are up for renewal, if they refuse to rectify this issue.