As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLT 6025 THE CREW REPORTED SMOKE IN CABIN WHILE AT FL240 DURING CRUISE FLIGHT. SMOKE SMELL IN COCKPIT AS WELL. THE AIRCRAFT DIVERTED INTO PIT AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 2 AIR CYCLE MACHINE. OPERATIONAL CHECKS WERE GOOD.