As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, THE PILOTS TURNED THE BLEEDS TO NORMAL IAW AFTER TAKEOFF CHECKLIST AND RECEIVED A RED LT DUCT LEAK ANNUNCIATION. PERFORMED THE QRH PROCEDURES AND RETURNED TO THE AIRPORT. MAINTENANCE TROUBLESHOT THE ISSUE TO THE LEFT CROSS BLEED TUBE ASSEMBLY BEING RUPTURED. MAINTENANCE REMOVED AND REPLACED THE TUBE ASSEMBLY AND PERFORMED OPERATIONAL CHECKS IAW AMM. NO FURTHER DEFECTS WERE NOTED IN THE AREA.