260V out of a 220V Outlet

Had the repairman over the other day to fix the electric dryer. Turned out is was a burned out heating element. Now, what was strange, was the voltage from the 220 outlet to the dryer. It first read 260V. About 20 minutes later, it went back down to 220 Volts. In the same room where the dryer is located, I got a light in the ceiling that occasionally will shut itself off. I flip the light switch on the wall to turn the light on , and the outside porch light that is tied into the light in laundry room, ( It's the back porch where the dryer is located,) the outside porch light turns on , but the ceiling light sometimes will not. Then sometimes it will go on.



It's shorting out somewhere, but where ???

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260V out of a 220V Outlet