What was found
STINKY FUMES AFTER APU BLEED SELECTED ON GROUND, NO PAX ON BOARD. DEBRIEFED FLIGHT CREW AS PER TASK CARD 0550-2002 STEPS 1-3. FOUND APU TO BE USED DURING EVENT AND PACK CONFIGURATION TO HAVE NO EFFECT. WIP 780291. C/W STEPS A-E PER MSI PREVENTION LOG 1698152. WIP 123277 C/W MSI LOG STEPS F-L. UPON INSPECTION NOTED APU GENERATOR LEAKING. R&R APU GENERATOR IAW A320 AMM 24-23. DURING INSPECTION NOTED MINOR UV LIGHT EVIDENCE OF COMPRESSOR DRAIN LINE OIL CONTAMINATION. (LP: 8621093, AIRCRAFT WAS GROUNDED)