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I'm a GE tech, the F7 means there is either a stuck button on the keypad or relay on the board behind the keypad. Shut off the breaker. Remove the 3 screws under the keypad and lift the panel a bit to remove it. Lay it face down on the top rack and disconnect the ribbon cable. Turn power back on and if f7 goes away the problem is in the keypad. If f76 returns it's in the control. We typically replace both together because usually if you replace 1 it will come back later then be the other part.
Your microwave turning on by itself is a "self preservation feature" of the GE Profile Advantium and maybe some other models. Read the manual, When your over the range oven gets warm enough, for whatever reason the venting fan comes on until a satisfactory oven temperature is reached. You are not permitted to shut the vent fan off. Also it seems a temperature near room temp must be achieved before it shuts the fan motor off, it is very annoying. We had to return our Advantium because of fan noise. I configured the ovens vent fan to the recirculate direction because we do not have a vent duct that exits the house over our range. When the vent fan acting as the ovens cooling fan automatically turned on we would have to leave the house to hear each other talk. Too bad we really liked the oven other than that major problem. G-Man