As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 20 MINUTES INTO ENGINE, START CHARGING SYSTEM STILL SHOWING 7 AMPS OF CHARGING. MAINT TECH FOUND VLOTAGE REGULATOR WAS NOT WORKING. VOLTAGE REGULATOR WAS REPLACED AND OPERATIONAL CHECK OF CHARGING SYSTEM CHECK, GOOD. NO RECOMMENDATIONS AT THIS TIME.