What was found
(CAN) THE ENGINE ROLLED BACK DURING A TLA MOVEMENT WHILE TAXIING ON THE WAY TO THE RUNWAY. N1 AND N2 SIMPLY ROLLED BACK RATHER THAN ACCELERATE WHEN COMMANDED. THE EEC, SENSING THE DECREASE IN N2, TRIED TO MAINTAIN THE ENGINE WITH INCREASED FUEL HOWEVER IT ONLY MANAGED TO MAX THE ITT AND BOUNCE THE CONTROL LOOP AROUND BETWEEN ILOOPS 3 (RATIO UNIT ACCEL), 8 (MAX WF DOT LIMIT), AND 12 (T45 LIMIT) AND ENGINE SHUTDOWN. (TC# 20190821004)