As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AUTOTHROTTLE WENT INTO RETARD ARMED MODE DURING INTERMEDIATE DESCENT AROUND 4500 FT, NOT YET LANDING CONFIGURATION. DISCONNECTED AUTOTHROTTLE AND SWITCHED ON AGAIN, BUT IMMEDIATELY RETARD ARMED. SO DISCONNECTED A SECOND TIME AND APPROACH FLOWN WITH MANUAL THRUST. NO FAULT FOUND. (TC# 20190430010)