As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE CREW RECEIVED A NR 2 SINGLE CHANNEL CAUTION. CREW ELECTED TO RETURN TO DEPARTURE. NO EMERGENCY DECLARED. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENACE REPLACED THE PROPELLER VALVE MODULE. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.