As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 410, CABIN BEGAN TO FILL WITH WHAT APPEARED TO BE (AIR CONDITIONING) AC SMOKE. CREW FOLLOWED AOM SMOKE CLEARING AND AC SMOKE PROCEDURES. AIRCRAFT DIVERTED TO MCO. THE APU'S OIL/AIR SEALS WERE FAILING AFTER RUN-UP. APU WAS DEFERRED PER MEL. (APU WOULD REQUIRE REPLACING).