Hello Seamus51 and welcome to the Community.
I would like to direct you to the appliance support line, 1-877-946-9843. Have your make and model number ready when you talk to them. They will be able to help you determine if this is a do it yourself project or if you will need professional assistance.
The following phone number is to the GE factory service center, 1-800-432-2737.
When working with any electrical appliance or fixture, it is very important that you unplug or disconnect the electricity supply before attempting any repair to avoid electrical shock.
Let me know if you need further assistance.
Charlotte
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I am a Home Depot associate trained and authorized to help people on the Internet.