As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YIP - SHUT DOWN NR 4 ENGINE FOR REDUCTION GEAR BOX LOW OIL PRESSURE INDICATIONS. GROUND RUN NR 4 ENGINE AND FOUND STARTER LEAKING. RESEALED STARTER GARLOCK AND SHAFT. CHECKED REDUCTION GEAR MAGNETIC PLUG FOR CONTAMINATION, INSUFFICIENT CONTAMINATION FOUND. CHANGED RGB OIL SCREEN, OPS CHECK GOOD ON GROUND RUN. (M)