As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU OIL FILTER DELTA P INDICATOR EXTENDED REQUIRES MAINT REF: T C 78349013. REPLACED APU OIL FILTER AND RESET DELTA P INDICATOR, OPERATED APU FOR 30 MIN AND RE-CHECKED DELTA P INDICATOR. INDICATOR REMAINS RESET AMM 49 91 13 & 49 91 12.