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Here's another fire alarm test/inspection - short and easy. \Switched it up and tripped it with duct detector test station The devices are all Simplex except for one A/V - as I recall there was a leaky roof incident that zapped the original one. One cannot "officially" buy Simplex parts through normal channels, and of course one cannot install used fire alarm devices - so usually a Gentex or System Sensor gets put in it's place. The original Simplex Panel was zapped by ground fault of some sort a while back. Fire Lite MS-5UD to the rescue!