As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE ASA LOG PAGE 60411597 DURING TROUBLE SHOOTING FOUND APU OIL FILTER CLOGGING INDICATOR TRIPPED. GROUNDED - YES. IN ACCORDANCE WITH B737-9 AMM 49-91-13-600-801 REMOVED AND REPLACED LUBE FILTER ELEMENT IN ACCORDANCE WITH AMM 49-91-12-600-801 LEAK CK GOOD.