As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN CLIMBING RPM WAS SELECTED AFTER TAKEOFF, THE LT ENGINE RPM FLUCTUATED 180 - 200 RPM AND LEFT TORQUE FLUCTUATED 3 - 5 PERCENT. ALL OTHER ENGINE OPERATIONS NORMAL. LOCKOUT WAS SELECTED AND ALL FLUCTUATIONS STOPPED. MAINTENANCE CLEANED AND RESECURED PCU CANNON PLUG. REPLACED SERVICEABLE FUEL USED INDICTATOR P/N 522781, S/N/OFF 05860182, SN/ON 03881530.