As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT LEFT OVERNIGHT IN THE COLD (-30) WITHOUT PLUG-IN. OIL COOLER CRACKED ON START-UP, AS INDICATED BY OIL LEAK FROM ENGINE COWL. S/N 912-10659-20 AND S/N K11-9935-34 REMOVED AND P/N 20006A S/N E91-1272-10 AND S/N E91-1272-4 INSTALLED.