As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASKCARD #N8349002 FOUND APU LUBE OIL FILTER INDICATOR RED BUTTON WAS EXTENDED. GROUNDED - YES. REPLACED APU LUBE OIL FILTER PER B737-900 AMM 49-91-12-400-802 AND OIL FILTER INDICATOR PER AMM 49-91-13-400-802. LEAK CHECK AND OPS CHECK GOOD.