I have a 9 year old Frigidaire electric dryer, model # GLEQ2152ES0, that runs fine, but no longer heats. The problem started about 6 months ago, and had been intermittent until recently. House circuit breaker had been replaced a couple of months ago. I have doubled checked voltage at plug and have 120 & 240. Checked control thermistor, thermal limiter and high limit thermostat & heat element, all have resistance... Anything else to check? Or does this mean its time to replace electronic control board? Thank you in advance for your time and assistance.