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To get more than 120 volts inside you most likely had a crossover between the two sides/legs of the power supply. This would cause a momentary surge in voltage. It will burn out some motors or cause others to over speed. Anything with a voltage protection device will trip out and require a reset. Lights will burn brightly as they are now putting out more wattage. Any voltage intolerant equipment such as TV's etc will get fried unless they have surge protection. The most obvious places to look for the cause of this surge are places where both phases/legs are present such as the fuse panel, the internal supply cabling and anything that uses 240 volts. If the cause is two wires that have rubbed together and damaged their insulation allowing the currents to combine or against a common ungrounded conductor then the problem may reappear. You could unplug and disconnect the supply cable and try checking for any continuity across the the two sides of the supply while shaking the cable. The same test can be used anywhere 240 is found in the unit. If you get any sign of connection you need to follow the cable until you find the point of crossover. Your electrician should know how to conduct this this test and inspection. Just remember to be unplugged and the cable not anywhere near the plug so someone doesn't plug you in while you are testing. Good luck.
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