What was found
AFTER STARTING BOTH ENGINES AND APU OFF REAR FA CALLED AND REPORTED DIRTY SOCKS SMELL. SMELL REMAINED AFTER SHUTTING RIGHT ENGINE DOWN. C/W SMOKE/FUME WC 0550-2001. P TRAK GRAPH INDICATED APU IS THE SOURCE. CONTINUED WITH WC 0550-2002 WITH NO FINDINGS. INSPECTED TAIL CONE AND APU TURBINE BLADES WITH BLACK LIGHT AND APPEARS OIL IS LEAKING AT 6 O'CLOCK STRUT (176559) R/R CABIN RECIRC FILTERS PER A220 AMP 21-22. C/W ECS DECONTAMINATION PER AMDS WORKCARD 0550-2003. C/W CAPTURE AND REPORT ODI FOLLOW UP PER WORKCARD 0550-9001-A220. (LP# 7598846)