I have a Nissan 70 outboard that has an alarm going off. The alarm goes off on first startup when the motor is cold and has been sitting in the water overnight and will continue after warmed up. It only goes off in forward or reverse. It does not go off in neutral. I recently replaced the water pump and have great water pressure coming out of both the check port and idler port. I cleaned and checked the oil filter and bleed the oil lines. There is plenty of oil in the reservoir and it does go down when I’m burning fuel. I inspected and cleaned off the overheat sensor. I even tried unplugging both sensors but the alarm still goes off. Is there any way to check if a sensor is bad? I don’t want to waist $70 bucks if I don’t have to. Is there a Thermstat on this motor. I cant find anything in the manual on it. Any help would be greatly appreciated.