What was found
WHEN CLIMBING TO ALTITUDE THE ELEC LIGHT ON MAP LIGHT UP AND EMERGENCY BUS OFF LIGHT CAME ON, ON THE OVERHEAD PANEL. EMERGENCY BUS 2CB (F10) AND DC INDICATION NR 2 (G4) BOTH POPPED. ATTEMPTED ONE RESET AND SAME THING HAPPENED AGAIN. BOTH TIMES THE CB'S POPPED AS AIRCRAFT ENCOUNTERED TURBULENCE. DIVERTED TO SFO. INSPECTED OVERHEAD CB'S PANEL, LEFT AND RIGHT DC RELAY BOXES. NO DEFECT FOUND. REPLACED EMERGENCY DC BUS 2 OFF RELAY K0440. RESET CB'S. OPS CHECK GOOD ON ENGINE RUN. UNABLE TO DUPLICATE DISCREPANCY.