As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT APU LOW OIL PRESS LIGHT CAME ON. APU AUTO SHUT DOWN. FOLLOWED QRH. PERFORMED FIM TASK 49 90 00 810 803 CONFIRMED FAULT 49.91007. OIL PRESSURE SHUT DOWN. REPLACED LOW OIL PRESSURE SWITCH REF MM 49 94 22 400 801. GROUND VERIFICATION TEST WAS NORMAL. NO FAULTS APU OPS & LEAK CHECK NORMAL.