As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MNL - FLT CS879 - L/P 7911528 - AIRCRAFT GATE RETURNED DUE TO HEAVY VIBRATIONS ON NR 1 ENGINE DURING START CYCLE. FOUND STARTER TURBINE WHEEL MISSING OUTER PORTION OF ALL BLADES. REMOVED AND REPLACED NR 1 ENGINE PNEU STARTER PER MM 80-11-31. GROUND ENGINE RUN CHECKED GOOD PER MM 72-20-0. (X)