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Re: AC Panal Lights???
Bump, I have no idea about your boat, but generally when a power fault indicator is blinking, that indicates an intermittent ground or other fault caused by loose wiring, etc. Loose wiring can cause arcing and eventually fire, even if it takes years before that happens.
Sounds like the shore power connection needs to be checked, and if there's nothing wrong in there, you'd need to check your own wiring for faults.
If your indicator is a neon bulb, it could also be flickering simply from old age, dying out. Still needs to be checked.