What was found
(CAN) FROM TOP OF DESCENT DOWN TO APPROX 400ASL, FAINT ODOR OF ELECTRICAL SMOKE IN FLIGHT DECK ONLY NOTHING VISIBLE, NO OTHER INDICATIONS. ALL NORMAL ON APPROACH. CHECKED FLT DECK AERA, ALL E & E BAYS FWD, MID & AFT, CHECKED O2 COMPARTMENT RAN APU & PACKS, CHECKED ALL CIRCUIT BREAKER IN FLT DECK NO ODORS NOTICED UNABLE TO DUPLICATE.