Thank God you mentioned it, otherwise he might have travelled upnorth looking for the valley.
btw - add that the valley is accessible after removing both upper and lower intake manifolds, and pray that the mechanic knows what a torque wrench is and where to find new genuine gaskets. Shlikone toob results in a forever P0171 or P0174 code or both.
And hope the mechanic doesnt mangle up the knock sensors or their wiring. Thats another bucket of worms.