What was found
ON FINAL APPROACH GOT SLIGHT DIRTY SOCK ODOR. FA'S REPORTED SAME ODOR IN CABIN, JUST PRIOR TO TOUCHDOWN. COCKPIT TEMP INCREASED TO 80 DEGREES, ON TAXI IN ODOR INCREASED. #1 PACK OUTLET TEMP INCREASED RADIPLY TO 55 DEGREES CELSIUS THEN DECREASED TO 5 DEGREES CELSIUS. AFTER ENG. SHUTDOWN, ON APU BLEED, PACK OUTLET TEMP INC. TO 55 DEGREES CELSIUS. C/W STEPS A THRU E PER NO GO ODI PREVENTION LOG. CW WORK CARD 0550-2002. INSPECTED APU FOR OIL LEAKS UTILIZING A BLACK LIGHT. NO EVIDENCE OF OIL PRESENT IN INLET. BLEED DUCTS OR PLENUM. DETERMINED THE SOURCE TO BE COMING FROM NUM 1 ENG. CW STEPS 1-3 PER WORKCARD 7900-2001. REMOVED SPINNER AND FOUND EVIDENCE OF OIL. R & R LPT SHAFT PLUG O-RINGS IAW A320 AMM 72-55. (521024) C/W THE COMPLETION OF AMDS WORK CARD 7900- 2001. OK FOR SERVICE.