As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2529 AMOKE AFT LAVATORY WARNING ILLUMINATED ON TAKEOFF ROLL. SMOKE ALARM WAS GOING OFF AND THERE WAS A PRESENCE OF SOME SMOKE, ACCORDING TO THE FLIGHT ATTENDANT. REMOVED AND REPLACED NEW WIRES ON APU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.