As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF RED "TAIL COMPARTMENT TEMP HIGH" AND "MASTER WARNING" LIGHT ILLUMINATED. INSPECTED TAIL COMPARTMENT FOUND AIR LEAK AT LT PACK PNEUMATIC DUCT. PERFORMED INSPECTION AND CHECK OF LT SECONDARY HEAT EXCHANGER AND FOUND CRACKED. R&R LT SECONDARY HEAT EXCHANGER. OPS CHECK NORMAL. NO LEAKS NOTED.