As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1700, ENROUTE HNL-ITO AIR TURNBACK/DISCREPANCY: NR 2 ENGINE TORQUE FLUCTUATES 10-15% IN CRUISE. RETURNED TO HNL. NO EMERGENCY DECLARED. LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: AFTER EXTENSIVE TROUBLESHOOTING, MAINTENANCE CLEANED THE NR 2 EEC CANNON PLUGS. SUCCESSFUL ENGINE GROUND RUN UPS.