What was found
ODOR OBSERVED IN COCKPIT ARRIVAL. ( PACKS A319 WITH MOD 31283/MP P7125 (FWC H2-F1 STND) AND WITH MOD. 30626/MP K6443 (ENHANCED ECS) - AT OR BELOW FL 370 )-PERFORMED TSM 05-50-00-810-831-A NO FRESH OIL LEAKS DETECTED @ THE APU . HOWEVER OLD DRY OIL COKE (LIGH) IS FOUND INSIDE INTAKE DIFFUSER. APU INTAKE IS CLEANED IAW T.S.M.: 49-00-00-810-921-A. AERO TRACER TEST IS PERFORMED OK. THIS MX ACTION ENDS DMI 24-71937-1. MOC IS NOTIFIED, PLACARD REM & DMI LOG UPD. MX ACTION IS REVERSED.