I've been looking for a rattle vibration sound for a while now that comes and goes. Found out it was the temperature/humidity sensor which is located next to the starter button. This sensor has a small (squirrel) fan to pull air across the sensor and this was making the noise. The sensor was $40 but well worth not having to listen to the noise coming from it. Here is a part number of the sensor if interested or have the same issue.
EG1Z19E616A
EG1Z19E616A