BK XXLS400-DF intermittent hum :(

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My sub of about 5 years old (and in constant use) is developing an intermittent hum which goes on switching off and re-powering.

I assume its the amp board that is the issue. Has anyone encountered the same and what's the best way of dealing of it? I still love the sub and despite a green light to replace from SWMBO have no intention of changing it.

Are the amp boards easy to swap out or is there another easy fix?

TIA

from AVForums http://bit.ly/2CHG5QY

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