Whirlpool Washing Machine AWM 8121

I have a front loader washing machine about 3 years old ?? Model Number AWM 8121 ( 6th Sense )
Developed a problem in that it would not drain and hence no spin either, although not happening every wash it would probably be 4 out of 5 wash cycles where it wouldnt work If drained manually ( gravity) washing machine would sometimes then complete cycle
Found sons credit card or remnants of it in outlet pipe leading to filter/water pump. Have removed what i could find from filter and outlet pipe and hey presto machine has been OK until now. A week or so but in that time machine still didnt drain although it worked fine more times than not ?
Not being 100% sure if ive got all of the card i will once again remove outlet pipe and check for more remnants of card
2 Questions.
1. If its not the card causing problem what would be or has a sensor or something been damaged ?
2. What sort of headache am i in for if i have to dismantle bowl assembly to see if card is caught in the bowl
any info would be appreciated
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