As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 189 - TIJ-MEX - AIRCRAFT RETURNED TO PLATFORM, OSCILLATION IN ENGINE PARAMETERS. OIL FILTER, OIL MAIN FILTER AND CHIP DETECTOR WERE VERIFIED. N2 WAS ADJUSTED AT LOW LEVEL REMAIN AT 52 PERCENT AND THE REST OF PARAMETERS WERE OK. AN ENGINE VISUAL INSPECTION WAS PERFORMED AT MEX RON. THE FCU WAS REPLACED AND ENGINE TEST WAS PERFORMED IAW MM 71-00-00. (M)