As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5204 - CLT-PGV - A/C WAS APPROXIMATELY 30 MINUTES OUTBOUND WHEN THE LEFT ENGINE RPM INDICATOR FELL TO ZERO. ALL OTHER ENGINE INDICATIONS WERE NORMAL. THE CAPTAIN DECIDED TO RETURN TO CLT FOR REPAIRS TO BE MADE. MAINTENANCE FOUND THE LEFT ENGINE TACH-GENERATOR TO BE DEFECTIVE. THE TACH-GENERATOR WAS REPLACED AND TESTED, AND THE AIRCRAFT RETURNED TO SERVICE.