As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING WALK AROUND FOR PDC. FOUND APU OIL FILTER RED BUTTON FOR OIL FILTER INDICATOR EXTENDED. ACFT GROUNDED. REPLACED APU LUBE FILTER ELEMENT INSP IAW AMM 49-91-12, NO DEFECTS NOTED. INSP MAG DRAIN PLUG IAW AMM 49-91-81. INST NEW O-RINGS, NO DEFECTS NOTED. RESET APU OIL FILTER DPI INDICATOR. RAN APU FOR DEFECTS, NO DEFECTS NOTED. APU OK FOR SERVICE.