As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK HEAT EXCHANGER DAMAGE, FLIGHT DIVERTED. LT PACK HEAT EXCHANGER SPLIT OPEN AT WELD ON TOP OF INSIDE CHAMBER. CRACK IS ON PRIMARY SIDE OF HEAT EXCHANGER. CRACK IS APPROX 7 INCH LONG ALONG A WELD. REPLACED LT PACK HEAT EXCHANGER PER MM. LEAK CHECKED GOOD.