What was found
IMMEDIATELY AFTER DOORS CLOSED, WHITE SMOKE THAT SMELLED LIKE A HOT PACK MOMENTARILY CAME FROM FO SIDE VENT. TURNED OFF PACKS NO ODOR IN CABIN. INSPECTED THE E/E COMPARTMENT FOR OBVIOUS DEFECTS, NONE FOUND, RAN BOTH PACKS NO ODOR NOTED, VISUAL INSPECTION OF APU NO LEAKS NOTED, PERFORMED COCKPIT AND CABIN TEMP CONTROL TEST IAW AMM 21-63-00-730-801A, TEST PASSED, NO FAULTS NOTED ON GROUND. OK TO CONTINUE.