As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER LEVEL OFF AT FL 380, "L BLD DUCT LEAK" EICAS MSG ANNUNCIATED. FOLLOWED FIM 26-18 FAULT TREE 804. PERFORMED LEAK CHECK, NO OBVIOUS LEAK NOTED. REMOVED AND REPLACED WHEEL WELL OVERHEAT CARD IAW AMM 26-10-01. OPS CHECK NORMAL.