As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT CREW EXPERIENCED A LOSS OF THE NR 2 PROPELLER RPM. ACFT RETURNED BACK TO AIRPORT & LANDED SAFELY. INSPECTED THE ACFT & FOUND THE RT WING TO NACELLE CONTROL CABLE AT FAULT. AFFECTED CABLE WAS REPLACED. RIGGING CHECKS WERE SATISFACTORY & ENG RUNS WERE SATISFACTORY.