As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU LOW OIL PRESSURE CAUTION LIGHT ON OVERHEAD PANEL ILLUMINATED. APU SHUT DOWN AUTOMATICALLY. TOTAL RUN TIME FROM START AT GATE ABOUT 2+45 HOURS. FOUND APU OIL COOLER CLOGGED. REPLACED IAW AMM 49 91 41 400 801. PRECAUTIONARY REPLACED APU LUBE MODULE IAW 49 91 11 400 802. RAN APU FOR APPROX 10 MINUTES OPS AND LEAK CHECK OK.