As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CLIMB AT 3500 FEET WHEN PILOTS REDUCED THROTTLE THE RIGHT PROPELLER WENT INTO FEATHER. QRH PROCEDURES FOLLOWED, EMERGENCY DECLARED AND AIRCRAFT RETURNED TO BASE (SJU). SUBSEQUENT MAINTENANCE INVESTIGATION FOUND AUTOFEATHER MICRO-SWITCHES OUT OF ADJUSTMENT. ADJUSTED SWITCHES AND RETURNED AIRCRAFT TO SERVICE.