As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT COCKPIT CREW SMELLED SMOKE AFTER TRANSFERRING THE PACKS TO THE APU. APPROXIMATELY 30 SECONDS LATER RECEIVED A ''SMOKE TOILET'' CAUTION MESSAGE. LAV SMOKE ALARM SOUNDED FOR APPROXIMATELY THREE MINUTES UNTIL THE GRH PROCEDURE WAS ACCOMPLISHED. FOUND APU OVER SERVICED BY APPROXIMATELY 1/2 QUART. ADJUSTED APU OIL SUMP LEVEL TO PROPER AMOUNT. GROUND RAN APU, OPS CHECK GOOD.