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my mercruiser twin is equipped with an Audio warning System. The buzzer sounds when the key is turned on and is supposed to stop when the engine starts. The mercruiser manual says it indicates l.1. low oil pressure. 2. high tempeture 3. low drive lubricant. All three are ok. where is the alarm located and what else should i be considering. Everything else runs good except for the high screeching buzzer. Thanks in advance.