What was found
APPROXIMATELY TWO HOURS INTO FLIGHT AT FL410, THE ACFT BEGAN TO DEVELOP A PETROLEUM BASED ODOR IN THE CABIN. INSPECTED AND FOUND APU LEAKING INTERNALLY. REMOVED AND INSTALLED REPAIRED APU IAW AMM 21-52-05-900-801, 21-52-13-100-801, 20-00-00-910-803, 20-00-00-910-801, AND 49-10-01-960-801.