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Hi, usually I would go through the process with a customer, in this case there is so much that it could be and so much information on the subject that I think I would assist you best by providing you with the electrical side technical and testing information documentation, as you say the transmission is recent, it makes sense to look at the electronics.
There is information relating to the warning buzzer, diagnostics using the panel and instructions to follow.
I hope this helps you get it running properly, you are most welcome to come back to me for an opinion.