As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT BELOW FL 180, LEFT PACK LT ILLUMINATED ALL THE WAY TO ENGINE SHUTDOWN AT GATE. GROUNDED-YES. FOUND PACK LIGHT LT ILLUMINATES ON MC RECALL. PERFORMED B737-800 FIM 21-53 TASK 821, FIM 21-62 TASK 801. FOUND LT PACK TCV RED LIGHT DISPLAYED. ATTEMPTED C/B CYCLE, PER FIM 21-62 TASK 830 NIL HELP. REPLACED LT PACK TCV, IAW B737-800 AMM 21-51-10/401. OPERATIONS NOW NORMAL & NO PACK LIGHTS ILLUMINATED W/ MC RECALL.