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C13 Actuator problems

I've got an '04 Peterbilt with the C13 engine. The dealer has put 3 sets of actuators(from various suppliers) in this truck,and i'm STILL having problems with losing boost,and the check engine light coming on.If you turn the key off,and let it reset it's fine for a while.I've been told that they still haven't got the actuator problem solved with replacement parts.I've also been told there's NO WARRANTY on a new one if i have it put in.....What are my options at this point now that the warranty has expired?