As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L ENG INFLIGHT SHUTDOWN AND AIR RETURN BACK TO PVG DUE TO OIL PRESSURE INDICATION (ENGINE) AMBER LEFT ENGINE DUE TO TRF BALANCE TUBE FOUND BROKEN AND DAMAGE TO THE CVT REPLACE ESN 900272 PRIOR TO NEXT FLIGH.ENGINE HAS BEEM REMOVED PER JOB CARD 25-7100-0911. THE NUMBER 1 ENGINE WAS INSTALLED PER WC 25-7100-1-0912. BY CHINA EASTERN. REQUIRED LEAK AND OPERATIONAL CHECKS WERE ACCOMPLISHED WITH NO DEFECTS,