As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A BLEED 2 LEAK MESSAGE AFTER TAKEOFF. THE AIRCRAFT RETURNED TO STL AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A BROKEN WIRE ON THE TEMP SENSOR NEAR THE ENGINE START GROUND PNEUMATIC CONNECTION. THE WIRE WAS INTERMITTENTLY GROUNDING OUT AND CAUSING A FALSE BLEED LEAK MESSAGE. WIRE W772-0001-24 WAS SOLDERED BACK ONTO THE THERMAL SWITCH IAW EMB SWPM 20-30-00 WITH NO FURTHER DEFECTS NOTED.