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Hi I'm Brian and I'll be happy to help with this!
Do you have a voltmeter and are you comfortable to probe for 24 volts ac on the EBTDR board on your air handler? If so, with power on to your air handler and the blower panel removed to access your board, probe between the C and R points on the board without disconnecting any wires (diagram shows blue and red wires connected there) and tell me if you have ~24Vac or not.
Also probe between XFMR-R and XFMR-C and tell me what you get.
I am using your diagram for color codes. I am using a picture of your board from the Goodman website for probe point designators. Better pics would be good, I can actually annotate them and point to the probe points. If your particular heater accessory has the circuit breaker option(s) in it, then you should shut them all the way off then turn them all the way on again. The points on the board at C and R are 24 volts after the fuse for use by your system and XFMR-C and XFMR-R on the board are before the fuse directly off of the 24 volt transformer.
I just want to see if you have ~24Vac everywhere (or anywhere) you're supposed to. If don't have 24 volts between XFMR-C and XFMR-R and you're comfortable probing high voltages, you can probe between the larger Red/Red and Black/Purple wire connections at the transformer. If you have 240 volts going into the transformer but don't have it coming out of the transformer between XFMR-C and XFMR-R on the board then you have a blown 24 volt transformer.
If you're not sure of any of my test procedures, send a pic and I'll mock it up.
Sounds good... standing by...