Cooling Fan stays on until the door is open

Yes. Faulty door interlock switches.
Replace the door switches with the correct ones.

On a few new model microwave ovens, this is a "feature"! It's purpose is to cool the microwave parts down, and to remind you that your food is cooked. Once you open the door, the fan will shut off and stay off when you close the door again. But if not, or if you microwave oven didn't use to do this, then you have a bad door switch.

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need to open the unit up and look for a fuse to be blown..

I have seen where one of the door switches becomes intermittent causing the symptoms you are describing, tough to nail down considering there are more than one door switches.

There are one or two door switches that are defective, the solution have them replaced for normal operation.

some switches are normally closed "short position" press switch "open" it will be labeled NC on the one side, "stands for normally closed" and others will be NO "stands for normally open" press switch "short" if there is no change in readings when you press switch it is defective.

Yes there is.

have a good look at front to see reset??.press it once it comes back on unplug from the wall and & open it up and go to the part and give it a good clean with wd40, check the push pad for ware & tare dirt gathers and builds up

Go to an appliance parts store to get the bulb.

Good Luck and Please rate fixya!

Replace the door switch I ordered mine at www.repairclinic.com