As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS TO FNL - CREW REPORTED APU AUTO SHUTDOWN DUE TO LOW OIL PRESSURE IN FLIGHT. AIRCRAFT RETURNED TO LAS AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED OIL PRESSURE LOW SWITCH IAW MM 49-90-03. APU OPERATIONALLY CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.