The radar scanner, a Raymarine RD218, came back from their repair facility. The diagnosis was--there is no problem. The scanner worked when put on the bench, and was checked out for more than six hours of run time in New Hampshire.
Therefore the problem has been isolated to the inter-unit wiring. The cable run from the display to the scanner has four multi-pin connectors and eight butt connectors in it. I received a list of expected pin-to-pin resistances as measured at the end nearest the display, and I have been checking them. They are failing, but in annoying ways, seeming to shift when I separate and reconnect the mast-base connectors.
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