As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU LOW OIL PRESSURE LIGHT BLINKED THEN CAME ON STEADY. APU SHOT DOWN. TROUBLESHOOT IAW FIM REF 49-90-00-810-803. REMOVED AND REPLACED OIL FILTER HOUSING AND DIFF. PRESSURE INDICATOR IAW AMM 49-91-13-4 RAN APU, NO LEAKS OR FAULTS DETECTED. OK FOR SERVICE. (K)