Anybody here who had its turbo checked and repaired outside of the casa ?

My uncle's Sta fe was diagnosed by Hyundai Dasma to be defective and recommended replacement of a new unit , cost est about P 90k. Hyundai voided the warranty because my uncle did not follow strictly the maintenance schedule of every 5000 km. Mileage is just 40k kms and just 3 years old.

Can you recommend any turbo especialist where we can have it checked and get a quote for its repair?
Thanks