As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 5972 - THE CREW REPORTED A BLEED 1/2 LEAK MESSAGE ON THE EICAS ON FINAL APPROACH. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE O-RING AT JOINT 15 OF THE BLEED AIR SYSTEM AND RE-SECURED THE DUCT. OPERATIONAL CHECKS WERE GOOD.