As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT (15000) EICAS "L PACK TEMP" CAME ON FOLLOWED QRH. TURNED OFF PACK. PERFORMED OPS CHECK OF LT PACK TEMP. NO DEFECTS NOTED IAW AMM 21-61-00. LT PACK TEMP CONTROLLER HAD LT MIX MANIFOLD TEMP SENSOR LIGHT TOOK 3 TIMES TO CLEAR FAULT. RAN PACK, NO FAULTS AT THIS TIME.