As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MSN 974 LEFT ENGINE FAILED TO RETURN TO LOWER POWER SETTING DURING TAXI THIS MORNING. WHEN L/H POWER LEVER RETURN TO IDLE POSITION THE NG STILL 68%, R/H IS NORMAL. AFTER REMOVE THE FCU CONTROL ROD , CORROSION IS FOUND ON ROD END BEARING. THEN WE HAVE REMOVED THE CORROSION OF THE BEARING, TEST POWER LEVER SEVERAL TIMES, L/H ENGINE POWER IS NORMAL. REF PSM1-64-4 CH 76-10-00 FIG 15 ITEM 185A (TC# 20190807008)