As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER HARD STARTING PROBLEM, ENGINE WAS TURNED BACKWARDS TO CLEAR CYLINDERS. MAIN OIL SUPPLY LINE WAS HYDRAULICED APART AT HOSE AND CLAMP CONNECTION AT CHECK VALVE LOCATED BETWEEN ENGINE AND OIL TANK. SUBMITTER STATES 'DO NOT TURN ENGINE BACKWARDS'.