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From: Damien Wyart <damien.wyart@free.fr>
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Subject: Re: Make Emacs print "^J" instead of "\n" with
	`print-escape-newlines'?
Date: Wed, 20 Nov 2013 21:48:48 +0100
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* Thorsten Jolitz <tjolitz@gmail.com> in gnu.emacs.help:
> > is there any way to make Emacs print "^J" instead of "\n" with
> > (print-escape-newlines t)?

> But I would still be interested in the first part.

I think you would need to modify the following part of src/print.c:

          if (c == '\n' && print_escape_newlines)
        {
          PRINTCHAR ('\\');
          PRINTCHAR ('n');
        }

(not sure how to tell PRINTCHAR to print ^J) and recompile Emacs.

-- 
DW