Miele Circulation Pump repair

[ccfromny]

Hi, I have Miele Futura Dimension that started tripping fault F79.  The control board looks okay, and the wiring looms looks like in good condition.  I took apart the circulation pump and it looks like the impeller is not spinning smoothly.   I tried take the impeller off without success.  Please see pic of impeller.  Any suggestions on how I can lubricate it or remove the impeller part to see if any gunk is there to prevent smooth spinning? 
 

thanks

[stewartservice]

These circulation motors are not serviceable just replaced. 

[pmo]

I have the exact same issue, I can't get the impeller removed to check/replace that upper bearing. Did you figure it out?