So I've taken a closer look at my 2014 CX5 FWD Touring and I've noticed that I also have this hood and driverside mirror vibration. I have a build date of Feb 2013.
To those on the fence about buying the car, this is NOT A SERIOUS PROBLEM. Don't let this turn you away. The vibrations don't make any noise and don't seem like any significant short term damage would result from it.
I've also read up on the TSB's, so I'll try to give my insight in relation to the TSB's.
My definition/interpretation of this hood shake is not really the whole hood itself shaking. It does not seem like it's loose. The vibration seems like the hood is just flexing under it's own weight. The flexing can be seen towards the center rear edge of the hood at the base of the windshield. The hood vibration does not happen all the time. Even at highway speeds, the hood does not really vibrate. I only notice the vibration when driving over rough roads at low or high speeds. When going over the rough road, the maximum amplitude of the vibration seems only be less than a 1/4 of an inch.
After reading the TSB, it basically acknowledges that the hood itself is flexing, which is what I'm observing with my hood. The hood is constructed with a support structure on the underside with the skin of the hood glued on top of it. It seems like there is not enough glue to attach the support structure to the skin. This allows the hood to flex under it's own weight when subjected to the up and down forces of going over rough roads. So the TSB basically instructs the tech to glue more surface area of the support structure to the skin of the hood, which provides more support and strength to minimize the flexing.
I took a look at my own hood after removing the pins holding the insulation and the insulation itself. Here is what I found.
You can see all the nodes/tabs which are the contact points where glue is applied to hold the support structure to the skin of the hood. The glue itself feels like a hard foam.
I've highlighted in green circles where the glue itself has broken/split.
Here are close ups of the broken glue locations. I did not cause any additional damage when inspecting the glue points. The way I tested each point was to push upwards on the skin to see if it would separate from the support structure. The unbroken points did not budge, where the broken points allowed the skin to flex.
Naturally resting.
Me putting a little bit of force to lift up the skin.
Naturally resting.
Me putting some force to lift up the skin.
You can see the crack in the glue/foam on the right side of the blob
Another visible breakage in the glue/foam.
The TSB puts glue along most of the support structure between the nodes/tabs, almost like a weather seal. I think this will significantly reinforce the structure of the hood and increase it's rigidity and decrease the amount of flexing the hood experiences.
Since the TSB is only for 2013's, I am going to contact my dealer and report these findings and show them the failed glue locations. Then hopefully they will be able to perform the TSB to my car under warranty so the issue can be resolved.