3.5 Ecoboost underboost code

mr2cam

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Hi guys, we recently got a 2014 Ford Ecoboost F150 in our shop, the truck has 2 brand new turbos on it from Ford and a brand new intercooler, he is getting an underboost code when climbing a steep grade hill. We are only able to simulate the code on a dyno since the closest high grade hill is like 45 minutes away. Truck is stock, and just to make sure I flashed a stock program on it using a ford scan tool. We have checked for boost leaks with a pressurized tester and found nothing. Any of you guys ran into a similar problem? We are a bit stumped on this one.
 

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