As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU LUBE FILTER DIFFERENTIAL FILTER INDICATOR HAS HISTORY OF INDICATOR FOUND EXTENDED WITH FILTER FOUND CLEAN. REPLACED APU OIL FILTER INDICATOR PER AMM 49 91 13 000 802 LEAK & OPS CHECK GOOD INDICATOR DID NOT EXTEND WHILE APU OPERATED.