1987-1994 Ford radio schematics

I'm looking for schematics for Ford radios from the late 80's to early 90's. I've struck out with online sites, local dealers and businesses that dealers use to fix electronics. Anybody have any thoughts on where to try next? Thanks
 
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The actual radios themselves?

I wish I could find that info out myself, especially on the 90's JBL units to wire in some AUX inputs.
The actual radios themselves?

I wish I could find that info out myself, especially on the 90's JBL units to wire in some AUX inputs.


Right now I have 2 F49F-19B132-AA's that have no right channel. Any thoughts on where to start diagnosing? And, yes, I have a couple that are good candidates for aux port additions.