As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AS BEGAIN DESCENT ONTO MEM RECEIVED LEVEL ONE AIR SYST 3 OFF ALERT AT APPROX IMATELY FL370 ASSOCIATED RED MANF LT NEXT TO #3 BLEED ALSO ILLUMINATED CORRESPONDING PNEUMATIC LINE FROM #3 BLEED TO #3 PACK REMAINED ILLUMINATED FOR APPOXIMATELY 5=10 MINUTES. REMOVED AND REPLACED AFT RUBBER BOOT AND CLAMPS BETWEEN HEAT EXCHANGER AND ACM. REF M/M 21-53-02-2.LEAK CHECKS GOOD.