As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER WAS DISASSEMBLED FOR O/H AND THE FOLLOWING WAS FOUND AT INSPECTION, THE PITCH CHANGE KNOBS ON BOTH BLADES ARE CORRODED AND ONE PITCH CHANGE KNOB HAS BEEN REWORKED BELOW MINIMUM SPECIFICATIONS. PROPER O/H TECHNIQUES AND INSP CRITERIA WOULD HAVE CAUGHT THE REWORKED PITCH CHANGE KNOB AND OVERHAULING OF THE PROPELLER AT RECOMMENDED SERVICE TIMES WOULD HAVE PREVENTED THE CORROSION OF THE PITCH CHANGE KNOB. (K)