As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU OIL FILTER DPI FOUND EXTENDED. GROUNDED - YES. APU OIL FILTER REMOVED AND REPLACED. DURING FILTER REPLACEMENT COULD NOT RESET INDICATOR. INDICATOR REPLACED AND OPS NORMAL. APU LEAK CHECK CARRIED OUT SATISFACTORY WITH NO LEAKS NOTED REF B737-800 AMM 49-91-13. ETPOS SIGNIFICANT TASK.