What was found
CLE - FLT 4056 - CREW REPORTED THAT DURING CLIMB THEY RECEIVED SMOKE IN THE COCKPIT AND CABIN. AIRCRAFT RETURNED TO FIELD WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE APU AS WELL AS THE APU COMPARTMENT FULL OF GLYCOL. THE AREAS WERE CLEANED OF GLYCOL IAW STANDARD MAINTENANCE PRACTICES, OPERATIONAL CHECKS WERE SATISFACTORY. AIRCRAFT RELEASED FOR SERVICE. (M)