What was found
DIRTY SOCK ODOR AT AND AFTER TOP OF DEAD, CLEARED AFTER A COUPLE MINS. PERFORMED ISOLATE SMOKE AND FUMES IN COCKPIT AND CABIN WC 0550- 2001. PERFORMED GVI OF ENG 1 AND ENG 2 WITH NTF IAW A220 AMP 72-00. PERFORMED GVI OF APU IAW AMP 49-10 WITH NTF EXTERNALLY (ES 791444) R/R RECIRCULATION FILTERS IAW AMP 21-22. C/W WORKCARD 0551-2001. FOUND APU TO BE SOURCE OF FUMES. C/W WORKCARD 0551-2002. PERFORMED ECS DECONTAMINATION WORKCARD 0551-2003 W/ GND A/C START CART. ODORS NO LONGER PRESENT. (LP# 9080968, 9080970; AIRCRAFT WAS GROUNDED)