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I  have 2 142 radios for my personal use and both are different on the solder side as far as parts added. the radios had not been touched inside when I got them so the addons must be factory. it has been a while since I did any thing to them. just remember extra caps and resisters on them. kind of like the 139xlr radios having extra parts on the solder side of the boards. think some of the radios had changes on them when they came out to correct some thing they would find after the 1st production runs.

who knows for sure is the hard answer to get. hope you get your working as you like it.