As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TOUCH DOWN DURING LANDING, F/A REPORTED A WHITE LIKE SMOKE SUBSTANCE COMING OUT OF LOWER "B" SIDE VENTS BETWEEN ROWS 5 AND 7 AFTER LANDING IT DISAPPEARED UPON FURTHER INVESTIGATION NO OTHER ANOMOLIES WERE NOTED. THERE WAS NO SMOKE SMELL AT ALL TO NEVER REOCCUR. PERFORMED OPS CHECK OF ACFT SYS IAW (DISTRUBITION) IAW 21-20-00 AND FIM 21-20-00- 810-801A. FOUND NO ABNORMAL ODOR OR SMOKE IN CABIN.