As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 1 HOUR 10 MINUTES INTO THE FLIGHT, ENCOUNTERED A "LT BLEED DUCT LEAK" EICAS MESSAGE, ALONG WITH "DUCT LEAK" CAUTION LIGHT AND MASTER CAUTION LIGHTS. THE LIGHTS AND EICAS MESSAGE INITIALLY CAME ON THEN WENT OFF AND CAME BACK ON STEADY. ACCOMPLISHED THE BLEED DUCT LEAK NON-NORMAL CHECKLIST AND ALL CAUTION AND EICAS MESSAGES WENT OUT. AIR TURNBACK ACCOMPLISHED; BACK TO DEPARTURE. DISPATCH. BEING WORKED.