As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5124 - ON TAXI RECEIVED AFT LAV SMOKE THEN FWD LAV SMOKE WARNING. F/A REPORTED SMELL AND LIGHT HAZE IN CABIN. NO FIRES REPORTED IN EITHER LAV. RAN RIGHT PACK ON APU FOR 2 HOURS, ALSO RAN ON NR 2 ENGINE TEMP CONTROL AUTO AND MANUAL MODES. NO FURTHER DEFECTS NOTED.