What was found
AT FLIGHT LEVEL 390 SMELLED FUMES IN COCKPIT. DECLARED AN EMERGENCY AND LANDED AT DEN AIRPORT. MED BRAKE WAS USED AND EMERGENCY EGRESS CONDUCTED. FSFO CHECKLIST EXECUTED. ISOLATED BURNED ODOR TO FLT ENGINEERS PANEL AND FOUND NR 3 ENGINE OIL QUANTITY IND INOP WHEN RUNNING NR 3 ENGINE. INDICATOR WOULD TEST NORMALLY, BUT INDICATION WOULD STAY FULL AFTER ENGINE START. REMOVED CONNECTOR AND FOUND BURNED ODOR AT INDICATOR. ORDERED NEW INDICATOR. REMOVED AND REPLACED NR 3 ENG OIL QTY INDICATOR PER MM 31-00-011-4 AND REF 79-31-000-5 FOR OPS CHECK. GAGE OPS CHECKS NORMAL. DURING TROUBLE SHOOTING, RAN ALL 3 ENGINES WITH PACKS OPERATING. NO ELECT BURNED ODOR NOTED.