Fan Cage Making noise on a Riello 40 FS?

My burner is making crazy noises on and off. All different kinds of sounds. I cleaned it, removed the fan cleaned that too and put it back, spins perfectly no faults, tightened everything.. cant find a solution.

The burner has been running for less than 4 years considering that it only runs in the winter for about 4 months.
NEED A SOLUTION ITS STOPPING US FROM SLEEPING!!!