What was found
STRONG DIRTY SOCK ODOR COMING FROM FLIGHT DECK. NOTICED THE ODOR IMMEDIATELY UPON BOARDING. APU & PACKS ON FOR MEL. SUSPECT POSSIBLE APU BLEED CONTAMINATION. PERFORMED LEVEL A DECONTAMINATION OF ECS PER WORKCARD 2100-2007. REF MD LOG 1521040 FOR COMPLETION OF NO GO ODI PREVENTION. REF LOG 8212698 FOR COMPLETION OF EXTRACT FAN MEL. R/R BOTH RECIRC FILTERS PER AMM 21-21. OPS GOOD. (LP: 8044913) AIRCRAFT WAS GROUNDED