As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLIGHT 2529, DURING CLIMB THE CREW REPORTED SMOKE IN THE COCKPIT AND CABIN. THE ACFT RETURNED TO PIT WHERE IT LANDED WITHOUT INCIDENT. CONTRACT MX INSPECTED THE ACFT AND RAN THE ENGINES WITH THE CREW AND COULD NOT DUPLICATE THE PROBLEM. ACFT WAS APPROVED FOR RETURN TO SERVICE.