As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 575 - MEX-CUN - AIRCRAFT RETURNED TO PLATFORM AS CONSEQUENCES OF NOT ACCELERATION OF THE LEFT ENGINE. WITHOUT TURN OFF ENGINES THE WATER TRAP WAS DRAINED AND THE THROTTLE CHAMBER WAS LUBRICATED. IS NECESSARY AN AIRCRAFT CHANGE TO MAKE AN FCU REPLACEMENT. AT MEX HANGAR, THE FCU OF THE ENGINE 1 WAS REPLACED, THROTTLE TESTS WERE PERFORMED IAW MM 73-20-01, OK. (M)