As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG - FLIGHT 2392 - CREW RECEIVED AN APU BOTTLE LOW MESSAGE WITH INTERMITTENT WARNINGS. MAINTENANCE CLEANED THE CONNECTOR P813, LOCATED ON THE REAR PRESSURE BULKHEAD. THE OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE. NO PARTS WERE REPLACED.