As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6356 - BOS-JFK - DURING CLIMB-OUT, RETURNED TO BOS DUE TO THE LEFT PROP HEAT FAILING. AIRCRAFT LANDED AT BOS WITH NO FURTHER INCIDENTS. MX REPLACED THE LEFT PROP DE-ICE LEAD. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)