look on the right side of the machine up high on the rotor housing thats the first place both my machines got thin.When I had the rotor out this winter I put a new and thicker piece on the rotor intake. let me know what you find.
look where the returns go back into the rotor. One of ours leaked there towards the front of the housing. Taped it up and finished up the year and then put a complete housing on it.