As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT PACK TEMP INOPERABLE. ENTERED INTO DMI 137689, MEL 21-51-03-01, CAT C. REMOVED AND REPLACED LT PACK CONTROLLER ASSEMBLY, IAW AMM 21-51-14-401. USED LOAN PARTS FROM UPS. THEN LT PACK OPERATION CHECK OK. CLOSED DMI 137689. T&I CC 0137Z.