What was found
(CAN) THE LENGTH OF THE SCREW THAT ATTACHES INSPECTION PLATE P/N D229-4 TO SCROLL SET P/N R7156 WAS EXTENDED THROUGH SCROLL SET TO A DEPTH THAT IT CONTACTED CONE P/N A187-4 CAUSING IT TO CHAFE AS THE FAN WHEEL ROTATED. UNABLE TO DETERMINE AT THIS TIME THE P/N OF THE SCREW THAT WAS INSTALLED. THE CORRECT P/N FROM ROBINSON R2 ILLUSTRATED PARTS CATALOG IS MS35206-227. IT IS SUSPECTED THAT AN OVERLY LONG SCREW WAS INSTALLED DURING THE ROTORCRAFT''S OVERHAUL.