Westernstar 4900fa with s60 modules communication issues

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{"text":"got westernstar 4900fa with s60 14l.i got check engine light the other day.so i pulled up the codes.its mainly showing SPN-625 fmi 9,4.(attached pdf of codes below)\nMy Machanic hooked up his laptop and found out that something is not communicating right on the j1939 communication system. We checked the terminating resistor.they are good.next he said we will have check each module to see where it’s intermittening.anybody have delt with this issue in the past??it would suck to tare down the dash and find out it’s something simple.","pics":"[]","canComment":true}