As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STANDBY INVERTER EICAS MSG AND ELEC SMOKE SMELL THROUGHOUT ENTIRE AIRCRAFT. STATIC INVERTER CHECK TESTED GOOD. CHECKED CABIN FOR SOURCE OF SMELL. SUSPECT SMELL ORIGINATED DURING RAIN STORM. SUSPECT ODOR CAME IN THRU APU PACK SYSTEM. VISUALLY INSPECTED E&E COMPARTMENT AND STBY INVERTER FOR SIGNS OF OVERHEATING. ALL NORMAL CONDITION. NO FURTHER OCCURRENCES.