As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEW APU RAN FOR 2 HRS WITH PACKS ON AND NOW THE ACFT HAS AN OIL ODOR IN THE CABIN. APU WILL BE DISASSEMBLED TO FIND SOURCE. APU SURGE VALVE REMOVED & DUCT CHECKED FOR CONTAMINATION, NONE FOUND, GROUND SERVICE AIR CONNECTIONS ALL CHECKED. NO CONTAMINATION. REPLACED APU IAW MM.