As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT AT FL330 APPROX 2:20 WITH THE APU SWITCH OFF AND THE APU SHUTDOWN, AN INTERMITTENT FIRE APU WARNING OCCURRED BRIEFLY AND THEN CLEARED ITSELF. THE APU HANDLE WAS PULLED AS PRECAUTION PER THE AMM. CHECKED CMC AND FOUND CMC MESSAGE INTERMITTENT. CHECKED APU COMPARTMENT FOR EVIDENCE OF FIRE, NONE FOUND. RESEATED APU AFLOTS CARD; ACCOMPLISHED APU FIRE WARNING TEST PER MM 26-11-00 AND APU OPS CHECK PER MM 49-11-00. BOTH OPS CHECKED NORMAL.