My dealer is asking for 13 hours labor to repair this when the warranty company will only pay for four hours. How long should it take to replace this part? They are asking me to pay about $3000 out of pocket after the almost $1000 that the warranty company dealer policy will pay. Is this really a $4000 fix on the 2021 AT4 sierra diesel engine? The truck has 71,000 miles and I purchased the extended warrant for five years 100,000 miles.