As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CREW REPORTED THE SMOKE TOILET CAUTION MESSAGE AT 9000 FEET. SMOKE WAS VISIBLE WHEN BLEED WAS TRANSFERRED IN CABIN AND COCKPIT WHEN BLEEDS WERE TRANSFERRED TO APU. AIRCRAFT DID AN EMERGENCY LANDING.THE MAINTENANCE FOUND OIL COMING FROM COMPRESSOR DRAIN OF THE APU. APU WAS DEFERRED TO BE REPLACED LATER.