As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL TEST ON LANDING. PACK LIGHT RESET OFF WHEN MASTER CAUTION WAS PRESSED. ACFT GROUNDED. REPLACED LT TEMP CONTROL VALVE (V139) IAW MM 21-61-21. PERFORMED FIM TASK 21-61-00-21-61, TASK 801, TEMP CONTINUE BITE PROCESS. OPS NORMAL.