As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE INSPECTION, DISCOVERED THE RIGHT ENGINE MOUNT TRUSS HAD BEEN CHAFED BEYOND ALLOWABLE LIMITS IN TWO PLACES BY A NR 8 STAINLESS STEEL HARD OIL SCAVAGE RETURN LINE. SUBMITTER ADVISES OTHERS WITH KA-B-100'S TO CHECK THIS AREA OF MOUNT TRUSS. THE CHAFED AREA WAS IN THE FORWARD BOTTOM AND OUTBOARD PORTION OF THE U-SHAPED PART.