As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LEFT STARTER GENERATOR FAILED APPROXIMATELY 20 MINUTES AFTER DEPARTURE. GENERATOR WENT OFF-LINE AND A LOW RUMBLE AND VIBRATION WAS NOTED COMING FROM THE LT ENGINE. ACFT RETURNED TO BASE AND UNIT WAS REPLACED. GROUND RUN C/O, ALL SYSTEMS CHECKED SERVICEABLE.