As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AZO - FLT 3003 - IN CRUISE FLIGHT, THE SEC INV CAUTION LIGHT ILLUMINATED, AND A LOUD POPPING SOUND WAS HEARD BY THE CREW. THE CREW ALSO NOTED AN AMMONIA TYPE SMELL. THE INVERTER SWITCH WAS SELECTED OFF AND THE AIRCRAFT CONTINUED TO AZO WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE SECONDARY INVERTER. ALL SYSTEMS OPERATED SATISFACTORILY. (X)