As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT DISPLAYED ON EICAS WITH APU FAULT LIGHT. APU AUTO SHUTDOWN AT FL360 4.5 INTO FLT. APU OIL PRESS FAULT FOUND ON ECU. SERVICED LOW OIL QUANTITY. WRENCH CHECKED ALL OIL PRESS LINES ACCESSIBLE ON APU AND FOUND SECURE. RAN APU FOR 1 HOUR AND RE-INSPECTED FOR LEAKS. NO LEAKS FOUND. OK FOR SERVICE.