What was found
CREW REPORTED AVIONICS SMOKE MASTER WARNING AT 10,000 CLIMBING OUT OF PHILADELPHIA. AN ELECTRICAL BURNING ODOR WAS NOTICED IN COCKPIT WITH NO VISIBLE SIGNS OF SMOKE. CREW DECLARED AN EMERGENCY, THE CABIN WAS PREPPED AND EMERGENCY EQUIPMENT WAS DISPATCHED. THE LANDING WAS UNEVENTFUL. MX RAN ENGINES AND ALL AVIONICS TO TRY TO DUPLICATE BURNING ODOR. NO SMOKE NOTED AND NO ECAM WARNING FAULTS. NO FAULTS NOTED. THE A/C WAS RETURNED TO SERVICE.