As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING APU GVI, FOUND DELTA P INDICATOR FOR OIL FILTER POPPED. ACFT GROUNDED. REMOVED AND REPLACED LUBE FILTER ELEMENT AND RESET OIL FILTER INDICATOR PIN IAW AMM 49-91-13. APU CHIP DETECTOR HAD NO METAL OR OTHER DEBRIS. OPERATED APU, NO LEAKS NOTED, AND OIL FILTER INDICATOR DID NOT POP AGAIN.