He said that it was a "huge surprise", describing how "My boy is here, and I walked him through tech to show him the process—smiling, happy with a third-place finish" before getting the nasty shock.
Joe Gibbs Racing subsequently released a statement indicating it would not appeal, saying: "We brought the #18 car back to our race shop and have identified the problem which caused us to measure low during the post-race inspection process in Pocono yesterday afternoon. We have made NASCAR aware of our findings and we accept the penalty they have issued today.
"The situation was caused when the left front spring became dislodged,” the team stated. “This resulted in the left front corner of the car to be lower and resulted in a change to the car's handling, which had to be compensated for during the race. Consequently, the car measured low during post-race inspection."