As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB OUT, THRUST SUDDENLY CHANGED FROM CLB2 TO GA THRUST BY ITSELF. PILOT TRIED TO SET BACK MANUALLY TO CLB THRUST, WHICH DIDN`T WORK AT THE BEGINNING.PILOT SWITCHED OFF AP AND AT AND TRIED AGAIN TO SWITCH IT BACK, WHICH WORKED THIS TIME. REST OF THE FLIGHT NORMAL BEHAVIOR OF AT. AT ALL TIMES NORMAL FMA INDICATIONS. (TC# 20190503016)