Ed, I've been working with them for about as long as you've had yours. The only trouble I've seen with the boards is after a near lightning strike - we had a string of failures (both in the Aqualogic boards and the Sta-Rite Max-E-Therm electrical components) after a series of violent electrical storms. If the failure occurred following a thunderstorm, your homeowner's insurance might cover the replacement (please note -- on a couple of the ones that were covered by insurance we had to leave the old/ damaged part(s) with the homeowner for the adjuster to see).

Now some bad news - depending on how often you run the cell, it may be very close to the end of it's life after 5 years It might be a good idea to set asside the cost of a new cell so you can have ~uninterrupted use of the system.