As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GROUND WITH BOTH PACKS ON LT PACK TRIP AND OVERHEAT LIGHT ILLUMINATED. SMOKE ENTERED IN THE COCKPIT. DEFERRED PER MEL 21-5-4 CAT C TRANSFERRED TO DMI 13119. PLACARD INSTALLED. MAINTENANCE CONTROL WAS NOTIFIED. COMPLIED WITH SP 21-5. REF DMI 13119, BOTH PACKS ON LEFT PACK TRIPPED OVERHEAT. REPLACED LT RELAY R596 PER M/M 21-50. OPS NORMAL. THIS CLEARS DMI 13119. PLACARDS REMOVED.