As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION OF APU FOUND OIL FILTER INDICATOR EXTENDED AND WILL NOT RESET. GROUNDED-YES. REMOVED AND INSPECTED BOTH LUBE FILTERS, NO DEBRIS FOUND. REMOVED AND REPLACED OIL FILTER INDICATOR AND LUBE FILTER ELEMENT, PER B737-800 AMM 49-91-13 AND 49-91-12. LEAKS CHECKS GOOD AND OPERATIONS TEST GOOD/ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.