As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAUSES NR TO BLEED OFF AFTER BEEPED TO 100 PERCENT. COVERED BY SEVERE PREMATURE WEAR. EVIDENCE OF TORSIONAL RESONANCE CONDITION BETWEEN PTG DRIVE & GEAR BOX DRIVE. WATER / RUST ON SEVERAL PARTS. SPEEDER SPRING & 2D CAM LEVER. ACTION TAKEN: SET PTG TORSIONAL DRIVE FILTER SHIMS TO HIGH LIMIT. AVOID GREASE CONTAMINATION OF DRIVE SPLINES, REPLACED WORN PARTS, CLEANED, REASSEMBLED & RECALIBRATED GOVERNOR.