Regal 4460 A/C

I have Marine Air model SVCD16K/2-HV.  Running into intermittent problem where display is dead.  I have ordered new display/interface but not sure that’s the issue.  I was going to try a new Ethernet cable but electrical box looks sealed and riveted to the unit.  There’s also a small black button on the unit, infrint of A on Danger tag that the prints don’t show.  When running air flow is good. No alarms on fresh water pump pressure (aft AC works well so I don’t think I have a water pressure issue). I’ve cleaned strainers and flushed the units to make sure I get good water flow through them.  Water pressure on all units is good, water is clean/clear so no buildup in units heat exchangers.

any suggestions