What was found
RETURNING, NOTICED A BURNING ODOR IN THE COCKPIT. ASKED THE CREW IF THEY COULD SMELL ANYTHING AND THEY INFORMED ME THEY COULD SMELL IT AS WELL. STARTED LOOKING FOR INDICATIONS AS TO WHERE THE ODOR WAS COMING FROM. THERE WERE NO INDICATION LIGHTS ON THE IIDS AND COULD NOT ISOLATE THE FAULT AT THAT MOMENT. WE WERE NOW STARTING OUR APPROACH, COMPLETED THE LANDING AND THEN GOT A RED MON INDICATION ON MY EADI. THEN NOTICED THE CO-PILOTS EHSI WAS DEAD. MX NOTIFIED OF A BURNING ODOR IN THE COCKPIT AND FOUND THE TUBE HAD SMOKED.