$1000 says it is NOT the DME.
Do a search for FRM. Could be PART of the issue.
Also dig into your wiring around the modules in the rear and up under the dash- looking for water damage and shorts.
IMO this will not be a 'one thing magic bullet'.
Reading codes on a car that doesnt run, that has been powered on and off- jumped- who knows what- over a period of weeks or months will likely give yoi as confusing mash up of codes. Codes that are due to low power and lack of coherent communications with other modules, and not necessarily due to hard singular faults
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