As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH TO STL - THE CREW RECEIVED A BLEED 1 LEAK MESSAGE DURING CLIMB AND RETURNED TO FIELD AT IAH. MAINTENANCE SECURED THE BLEED 1 SYSTEM CLOSED AND DEFERRED THE NR 1 BLEED SYSTEM. ON THE 26TH MAINTENANCE TROUBLESHOT THE BLEED SYSTEM AND FOUND A LEAK COMING FROM THE LEFT UPPER T-DUCT IN THE CARGO COMPARTMENT. MAINTENANCE REPLACED THE T-DUCT AND THERE WERE NO FURTHER BLEED LEAKS NOTED.