As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED INSPECTION, HEAT EXCHANGER SIDE PLATE HAD THREE CRACKS ABOUT .35 INCH LONG. OPPOSITE SIDE OF THE HEAT EXCHANGER WAS CRACKED IN TWO OF THE FOUR CORNERS. A NEW EXCHANGER WAS INSTALLED. PREFORMED A LEAK CHECK ON THE DEFECTIVE UNIT AND FOUND THE CRACKS EXTENDED INTO THE COOLING FIN AREA, WHERE THEY CAN NOT BE SEEN. THIS CONDITION HAS ALSO BEEN REPROTED TO MFG UNDER SCR 650312.