Got it apart, fixed and back together. Not as hard as I thought it
might be. There were 4 pieces of debris lodged in the fan. The main
culprit was a label from Hyundai Motor Company for a Bosch part which
I suspect is the label off the fan itself. There was also a maple leaf
seed (which was what I thought I would find) another piece of dirty
paper? and a leaf.
All quiet now!
>> Stay informed about: fan noise