I had the same stuff in the house I bought here almost 3 years ago but I was too tight on time to worry about trying to get any help from the manufacturer.
This is the first time I have come across the Goodman name that was so easily legible. I thought since Goodman is still in business, it would be worth a shot to investigate for my client.

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002