As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING ENGINE A STRONG SMELL OF SULFUR WAS DETECTED IN COCKPIT. PILOT INSTRUCTED CLINICIAN TO GO OUTSIDE AND VERIFY ANY ODORS FROM AIRCRAFT HE REPORTED ROTTEN EGGS SMELL. PILOT IMMEDIATELY SHUT DOWN AIRCRAFT. START PROCEDURES APPEARED NORMAL VDC DROPPED TO 18 THEN RECOVERED AND AFTER GENERATOR WAS PLACED ON LINE 28.5 VOLTS WITH 100 AMPS AND DECLINING.