As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL AT 80 KIAS, RECEIVED A MASTER CAUTION WARNING LIGHT, "SMOKE AFT LAV" & "FIRE SYSTEM FAULT" STATUS MESSAGE. INSPECTED LAV FOR EVIDENCE OF SMOKE. NO EVIDENCE FOUND. PERFORMED OP'S CHECK ON LAV SMOKE DETECTOR SYS IAW AMM 26-10-00. OP'S CHECK GOOD AT THIS TIME.