As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FDM 6128 FLL (1735 PHX LCL) - CREW RETURNED TO THE FIELD DUE TO LAV SMOKE WARNING. MX PERFORMED DETAILED GVI OF LAV, CABIN, CARGO BAY AND AFT EQUIPMENT BAY NO EVIDENCE OF SMOKE OR FIRE. PERFORMED ENGINE RUN WITH BOTH PACKS ON NO EVIDENCE OF SMOKE NOTED. PERFORMED OPS CHECK OF LAV SMOKE DETECTOR, OPS CHECK GOOD.