As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A BLEED 1 LEAK MESSAGE WHILE CLIMBING OUT OF KORD. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE NR 1 BLEED SYSTEM AND FOUND THE O-RINGS AT JOINTS 5 AND 13 LEAKING. THE O-RINGS WERE REPLACED WITH NO FURTHER LEAKS NOTED.