As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT NOTICED ENGINE SEEPING FROM LT ENGINE COWL, THEY WERE NEAR THE AIRPORT AND DECIDED TO SHUTDOWN LT ENGINE TO PREVENT ENGINE DAMAGE. IT WAS DETERMINED ON THE GROUND BY MAINTENANCE THAT THE LT PROP SEAL HAD BLOWN DUE TO A FROZEN BREATHER. IT WAS DETERMINED THAT PROBLEM RESULTED FROM AN EXTREME DROP IN TEMPERATURE CAUSING ANY MOISTURE IN THE BREATHER FROM PREHEAT TO FREEZE. PROP SEAL WAS REPLACED AND TEST FLIGHT SUCCESSFUL.