As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH HAD A UNCOMMANDED TURN TO THE RT WITH SPEED BRAKES EXTENDED. AIRCRAFT WAS AT APPROACH SPEED. CHECKED LEFT AND RIGHT SPOILER CABLE TENSIONS FOUND NORMAL AT 82 FOUND IAW HAWKER 400XP M.M. CH 27-60-00 CHART 201. FOUND LEFT SIDE SPEEDBRAKE EXTENDING SLIGHTLY SLOWER THAN RIGHT. CLEANED AND LUBRICATED FRICTION POINTS IN SPOILER MIXER. OPERATIONAL CHECK GOOD ON GROUND. PERFORMED IAW 400XP MM CH 27-60-00 PG 203