We in the UK have had a big discussion on this subject for years. Triumph are at present replacing front rotors even if the bike is out of Warranty. Mine is infact a year out of warranty and at the factory at the moment going through some tests to see if they can sort this problem out.
I suggest you either telephone the warranty department at Triumph or fax them and get it from the horses mouth rather than going through your dealer who will probably have to do the same.
Triumph reception desk ask to be put through to Mark Swepson (Warranty Manager)
Telephone +44 (outside UK)1455 251700 (business hours 09.00 - 17.00)Don't forgot time difference
Fax +44 (outside UK)1455 453005 (only works business hours)For your records though just under 11,000 miles on the clock and this will be my fourth replacement rotor, and I have also had a replacement front wheel bike is a BA made in 2004. I know of only one other bike that has been back to the factory and that was Adey's they sent it back to him with replacement rotor and a new front wheel that was last year. He has now got a warped front rotor.
See also my post "Back to Triumph factory, link below:-
Back to Triumph FactoryHope this puts your mind at ease, let us know your outcome if going through the dealer or contacting Triumph in the UK.
Might be worth starting a thread to find out how many bikes on here have suffered with the warped rotor/disc problem and what they have done to remedy the problem..
