I went to take a look at a cabinet incubator that was advertised locally, and the seller told me I could have it for free if i'd hatch him some quail and pheasants! It was a deal! It came with three egg turners and three hatching trays. I brought it home, plugged it in, and it is all working but I have a temperature issue. I can't get it to heat above 85F but the thermostat is turned up all the way. Is this more likely to be a thermostat or element issue?