As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YMX: AFTER ABOUT 1 HR INTO FLT, LWR AFT BODY OVERHEAT LIGHT CAME ON PERFORMED ABNORMAL CHECKLIST, LIGHT WENT OUT. PROCEDURE STATED LEAK IS BETWEEN BLEED VALVE AND PACK VALVE. (PROBLEM NR 1 BLEED). REMOVED AND REPLACED COUPLING ASSY (ON LINE GOING TO PURGE VALVE) ON LT AIR CLEANER DUE TO LEAKING. LEAK CHECK C/O AND SYSTEM FOUND SERVICEABLE.