Thanks for all your advice ppl!
I have contacted the online store who told me to contact Burton Warranty US.
When I called Burton US, they told me to call Burton AU (since I am located in AU).
I have spoken to Burton AU, but they are reluctant to be responsible as this item was purchased from US.
I am still waiting to hear from Burton AU with a final answer.
If they are not willing to have a look at my board, then I will have to contact Burton US or the store again.
Will let u guys updated. Thanks!