As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT, THE CREW REPORTED VISABLE SMOKE AND BLACK SOOT COMING FROM AIR VENTS IN FLIGHT DECK ALSO, FLIGHT ATTENDANT ALSO NOTED SMOKE IN CABIN AND CRACKLING NOISE FROM UNDER CABIN FLOOR. CREW DIVERTED TO ROA, EMERGENCY WAS DECLARED AND CFR FOLLOWED A/C TO GATE WITH NO FURTHER INCIDENT REPORTED. REPLACED NR 1 ACM. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)