What was found
MALFUNCTION: GOUGING ON AFT EDGE OF LEVER ASSY WHERE LEVER CONTACTS CONTROL STAND, WHICH MAY CAUSE AN OVER CENTER OF LINKAGE CONTROLS ALONG THE THRUST CONTROL SYSTEM. PROBABLE CAUSE: METAL TO METAL CONTACT AND/OR VIBRATION WHEN THE THROTTLE LEVER IS PULLED INTO THE LOW POWER SETTING AND THE THRUST REVERSER LEVER IS PULLED UP TO ACTIVATE REVERSERS. RECOMMENDATION: ADDING A RUBBER BUMPER OR A PHENOLIC LAMINATE TO THE SECTION OF THE CONTROL STAND WHERE THE LEVER ASSY MATE.