My 406 Aft Cabin gave me about one second of discharge alarm for the Fireboy engine compartment fire suppression system. After returning to port I got several more intermittent and very short beeps. Its a clean system - not Halon - and the bottle still indicates in the upper part of the normal pressure range, so I suspect an indication failure instead of a discharge. The Fireboy discharge alarm is set off simply by low pressure at the sensor on the bottle. Fireboy says its either a bad pressure sensor requiring an expensive return to the factory for replacement or an electrical break in the sensor wiring. Any ideas out there on where to start on the electrical search. Thought I'd act like a boat owner and try the cheapest route first.