As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4292 - ON CLIMBOUT CREW OBSERVED SMOKE IN THE CABIN AND COCKPIT. CREW ELECTED TO RETURN TO CMH. AIRCRAFT LANDED AND TAXIED SAFELY TO THE GATE WITHOUT FURTHER INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NUMBER ONE ENGINE IAW WORK CARD 71-000-00. GROUND OPERATIONAL AND LEAK CHECKS GOOD AT THIS TIME. AIRCRAFT RETURNED TO SERVICE.