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Welcome. My name is ***** ***** would be glad to assist.
Please provide some more detail on the situation if you could.
1. The GFCI with the light, is this a receptacle you are referencing?
2. Can you look at the unit outside and see if there is a large box that has a disconnect for the outside unit to shut down power for working on the unit?
3.Do you have a 2 lead voltage tester with readout?
4. The electrician referenced, did they perform any testing at all?
As much of the details on the situation as it is will help.
Let me know and we can continue,