As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, THE NR 4 ENGINE EGT WENT TO TOP OF GAUGE FOR APPROXIMATELY 90 TO 120 SECONDS. ALSO, NR 4 ENGINE OIL RPESSURE WARNING LIGHT ILLUMINATED. NO FIRE WARNING AND OIL TEMPERATURE WAS NORMAL. MAINTENANCE INSPECTED ENGINE PER MM 72-00-00. NO DEFECTS WERE NOTED. ENGINE RUN AT IDLE CHECKED GOOD. SPECIFIC PART CAUSING PROBLEM TO BE DETERMINED.