As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: --DECISION WAS MADE TO DIVERT TO GEG. EMERGENCY DECLARED; AIRCRAFT LANDED WITHOUT INCIDENT -- APU SHUT DOWN WITH LOW OIL PRESSURE MESSAGE IN CRUISE AT FL380 TWO TIMES WHILE IT WAS BEING USED AN AN ELECTRICAL SOURCE DUE TO SOURCE 1 OFF. BITE TEST OF APU SHOWED NUMEROUS HITS FOR OIL QUANTITY SENSOR FAULTS. REMOVED AND REPLACED OIL QUANTITY SENSOR PER AMM 49-94-11. AS PRECAUTIONARY ALSO REPLACED LOW OILPRESSURE SWITCH PER AMM 49-94-22.