As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ENGINE OVERHAUL, PRIOR TO INSTALLING OIL SUCTION TUBE ASSY'S IN TWO IO-520D ENGINES, BOTH WERE DISCOVERED TO BE DEFECTIVE. ONE TUBE WOULD NOT FIT PROPERLY AND APPEARED TO HAVE NOT BEEN JIGGED PROPERLY IN THE WELDING PROCESS. THE OTHER TUBE HAD SPOT WELDS BROKEN LOOSE AND THE BRAZING PROCESS WAS INCOMPLETE.