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Hello my name is ***** ***** I will assist you. The solid alarm will indicate an overheat. Since the alarm only sounds once i am thinking that the problem is coming from the temperature sensor. Do you have a temperature gauge? Is it reading overheat?
Hi, yes it seems that the problem here is either a bad connection or a corroded lead. Best thing to do is to start by checking all the earth leads and the wires going from the ECU to the sensor for corrosion. The earth leads tend to corrode from behind as on the front normally there is resin on them. Also let someone steer the engine and check the wiring for anything that may be shorting to ground or getting loose etc...
Keep me updated of your findings