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I have 2 older 6000s I bought used, and 2 6200s I bought new about a year and a half ago. After about 6 or eight months of use I came home from work to find two units (1 of the 6000s and one of the 6200s) sounding their alarms. After thoroughly cleaning both (there was minimal build up and they both turned freely by hand prior to cleaning) there is no improvement, both pumps will not run. The remaining two still run like champs. What are your thoughts on the potential problem and it's remedy?
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