As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 380 WE EXPERIENCED A "SMOKE IN RECIRC BAY " EICAS MESSAGE IN CABIN AND FUMES THROUGHOUT. EMERGENCY DESCENT, EMERGENCY DECLARED AND DIVERTED. R & R THE RECIRCULATION FAN FILTERS IAW AMM 21-24-02. R & R THE RECIRCULATION FANS IAW AMM 21-24-01. OPS & LEAK CHECKED GOOD. NO ODORS NOTED.