What was found
DURING CLIMB OUT COCKPIT FILLED WITH WHITE SMOKE (SMELLED AND TASTED ELECTRIC) DISCONNECTED GALLEY ELECTRIC NO CHANGE, DUMPED CABIN SMOKE, DISSIPATED TEMPORARILY THAN RETURNED. RETURNED TO DEPARTURE. FOUND LT ENGINE OVERSERVICED WITH ENGINE OIL. DRAINED ENGINE OIL TO PROPER LEVEL IAW MM 12-17-00. RAN APU AND BOTH ENGINES SEVERAL HOURS TO BURN OUT THE OIL RESIDUE FROM THE BLEED AIR DUCTS.