As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE UNCOMMANDED DISENGAGE ON APPROACH. PREVIOUS CREW REPORTED SAME ANOMALY, BUT WASN'T SURE IF THEY HAD ACCIDENTALLY DISENGAGED IT OR IF A/T DISENGAGED ON ITS OWN. WE DID NOT REENGAGE A/T AFTER IT DISENGAGED MANUAL THRUST TILL LANDING. PERFORMED AUTO THROTTLE / THRUST CONTROL QUADRANT INTERFACE OPERATIONAL TEST IAW E175 AMM 22-31-00-710-801-A. OPS CHECK GOOD. NO DEFECTS NOTED, RETURNED TO SERVICE.