What was found
AFTER LANDING AFT SMOKE IN LAV RED LIGHT CAME ON, APU ON, SMELLED LIKE PACKS, TURNED OFF PACKS, LIGHT WENT OUT AFTER 2 MIN. VISUAL INSPECTION BY FA AND LAX FIRE DEPT. (FLT 6462) INSPECTED A/C FOUND NO SIGNS OF SMOKE IN CABIN. RAN ENGINES AND SWAPPED BLEED AIR FROM APU TO ENGINES SEVERAL TIMES, WITH NO PROBLEMS OR PACK PROBLEMS. LAV SMOKE DETECTOR ALSO OPS CHECKS GOOD. NO OTHER DEFECTS NOTED. A/C OK FOR SERVICE.