What was found
DUCT MONITOR FAULT STATUS MESSAGE APPEARED SHORTLY AFTER TAKE OFF THEN A LT BLEED DUCT WARNING MESSASGE APPEARED, LEFT BLEED VALVE CLOSED. EMERGENCY DESCENT WAS COMMENCED. AT 10000 FT THE UNPRESSURIZED FLIGHT PROCEDURE WAS COMPLETED, DURING WHICH A SMOKE ODOR ENTERED THE CABIN. DIVERTED AND A NORMAL, LANDING WAS MADE. REMOVED AND REPLACED THE CERAMIC INSERTS ON MT139 IAW AMM. OPS CHECKED GOOD.