I am dealing with a stock head unit that died as well, and called Daryl as well.
He's a great guy, and has a solution that essentially removes the guts of the stock unit and substitutes the innards of a newer unit.
I'd rather have the original unit rebuilt, but apparently there aren't schematics out there that would allow testing/rebuilding of the unit that came with the car.
If anybody knows an an electronics wiz who would be willing to take on the project-let me know!