DONT KNOW WHERE YOU CAN GET REPLACEMENT 
BUT BEFORE YOU DO ANYTHING UNPLUG CHAIR 
THEN SPLIT HAND CONTROL TAKING CARE NOT TO DROP ANY BITS SHOULD BE 1 OR 2 SCREWS ON BACK 
WHEN OPEN SEPERATE  & JUST BLOW GENTLY INTO THE CIRCUIT & BRUSHES THIS MAY RECTIFY PROBLEM IF NOT YOU CAN GET MOTOR FIXED OR REPLACED 
I WILL TRY TO FIND OUT WHO DOES THEM NOW 
I AM A FORMER CHAIR ENGINEER
                
 COLIN
                
 November 2009