have seen this before. intermitent for about 6 months, another tech replaced the cassette pwb but did not seem to work. i went out after and assumed the other tech did it correctly and double checked his work. i was wrong... after spending hours checking everything realized that the previous tech did not push the connectors all the way till they clicked. pushed all the connectors in all the way on cassette pwb and has been over 2 months now without any problems.
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