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MPD not getting J1939 data

Both mains have stars at the data fields on the MPD's. The code is Souce 242 Bridge MPD/ SPN: 608/J1587 Network 1/ FMI 2 - erratic. Intermittent, or incorrect. I have gone thru the service manual and tested all of the steps checking the resistors and the harnesses etc. everything but trying them on another boat. The boat sit for two months and they were working when stopped. Any insight would be helpful.