As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH TO STL. DURING CLIMB THE CREW RECEIVED A BLEED 1 LEAK MESSAGE AT 4,000FT. THE MESSAGE DISAPPEARED AND THEN RETURNED AT 8,000 FT. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE BLEED 1 SYSTEM FOR LEAKS AND REPAIRED A LEAKING JOINT IN THE AFT AVIONICS COMPARTMENT. AFTER REPLACING THE O-RING IN THE JOINT, THE BLEED SYSTEM OPS CHECKED GOOD.