As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS COCKPIT AND CABIN HAVE AN OIL SMELL WITH AC PACKS ON. MAINTENANCE PERFORMED CARD 26L00021004 AND DETERMINED THAT THE SOURCE WAS FROM THE APU. APU PLACED ON MEL. ***SUPPLEMENTAL INFORMATION: MAINTENANCE ACCOMPLISHED CARDS 26L00021002 AND 26L00021004, FOUND GREEN HYD RESERVOIR DRAIN VALVE LEAKING INTO APU INTAKE. MAINTENANCE REMOVED AND REPLACED GREEN HYDRAULIC RESERVOIR DRAIN VALVE IAW AMM 29-11-41. CLEANED AREA AS REQUIRED.