KEF PSW1000 SUBWOOFER, SPARES OR REPAIR ?

KEF PSW1000 HOME CINEMA SUBWOOFER. VERY NICE SUBWOOFER BUT HAS A BUZZING FAULT. NEEDS THE FOLLOWING REPAIR http://lug.demon.co.uk/kefdoc/How_to_replace_C52.pdf 200 WHEN NEW, AND WHEN WORKING MAKES THE ROOM ALIVE WITH BASS! PLEASE NOTE THIS ITEM NEEDS REAPIRING BEFORE IT WILL WORK. WILL ALSO NEED A MAINS LEAD BUT WILL SHOW PROBLEM IF REQUIRED. ANY QUESTIONS PLEASE ASK.