As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK WITH ALL THREE ENGINES RUNNING WE COMPLETED ALL APPROPRIATE CHECKLISTS FOR MULTIPLE MEL'S. THE NR 3 AIR SYSTEM SHOWS AN AMBER BOXED PRESSURE WITH A LVL 2 ALERT "AIR SYS 3 PRES LO" BLD 3 OFF / 1-3 ISOL VLV ON / PACK 3 OFF.