Most 'flat' cans are bonded but not all, the last ones were sintered. However all ribbed cans are sintered! If you turn the output shaft by hand if it noticably flicks from the pole to pole as you turn it it's sintered, if it feels like there is no resistance it's bonded or knackered.
I have heard of rotors debonded, in fact Tom has done it once but in that case there was no drive at all.
I'd take it apart and check it all over then idelaly try swapping the rotor. I have a used one you could try but no idea when I'll see you next?
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