As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2971, THE CREW REPORTED LOSS OF ENGINE TWO OIL QUANTITY AND PRESSURE. THE CREW SHUT DOWN THE NUMBER TWO ENGINE, AND RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NUMBER FOUR GENERATOR GARLOCK SEAL. OPERATIONAL AND LEAK CHECKS WITHOUT DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.