As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FLAMEOUT, FLIGHT DIVERTED. FLAMED OUT WHEN ELECTRIC POWER APPLIED. FOUND APU OIL CAP OFF OIL TANK & OIL QTY AT APPROX 2 QTS. INSPECTED CHIP DETECTOR AND NO METAL NOTED. REMOVED AND REPLACED CHIP DETECTOR AS IT ALSO WAS LEAKING. SERVICED APU OIL QTY TO FULL. APU RAN NORMALLY WITH NO LEAKS NOTED.