As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- ON FLIGHT 2438 OUT OF 10,000 FEET ON ARRIVAL TO PDX, RECIEVED A "APU FAULT" CAUTION MESSAGE. APU OPERATED NORMALLY. BEGAN TO RUN ABNORMAL CHECKLIST AND MESSAGE WENT OUT AFTER TWO MINUTES. REMOVED AND REPLACED DEPRIME SELINOID VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.