As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED UNABLE TO START LEFT ENGINE. INSPECTED STARTER DRIVE UNIT AND FOUND CLUTCH SPRING BROKEN. REPLACED WITH CONTINENTAL KIT R-EQ6642 CONTAING AN OVERHAULED STARTER DRIVE UNIT AND CRANKSHAFT GEAR. FAILURE COULD BE CAUSED BY ENGINE KICK BACK AT START.