What was found
STL - UNSCHEDULED LANDING - EMERGENCY DECLARED - 6/7/01 - FLT 116 - ABOUT 1 HR INTO FLIGHT FROM CMH TO LAS AT FL 350, UPON TURNING THE DOME LIGHT ON A BRIGHT FLASH AND A LOUD POP IN THE AREA OF TOP C/B PANEL; THE DOME LIGHT WENT OUT; CHECKED C/B'S, NONE POPPED. CREW SMELLED ELEC SMOKE & FUMES; DONNED OXYGEN MASKS, DECLARED EMERGENCY, PREPARED CABIN & LANDED AT STL; AFTER CLEARING THE RUNWAY CHECKED FOR FUMES, NONE PRESENT, TERMINATED EMERGENCY & TAXIED TO THE GATE. STL MX FOUND THE FIRST OFFICER'S DOME LIGHT BULB BLOWN; RELAMPED AND FUNCTIONALLY CHECKED NORMAL. VISUALLY INSPECTED WIRING BEHIND C/B PANELS 121VU & 122VU, NO DISCREPANCIES FOUND; THE A/C RETURNED TO SERVICE.