Thanks to Raymie for posting the MARMOR ID (below) in May, this mystery is solved.
XHFX-4 Morelia, Michoacan has not been IDed here in years, but I do have XHFX ID material on tape.
The poor-quality XHFX ID photos show the upper left corner of the screen, which was recorded on
July 13, 2006.
I never could figure out what the very thin first letters on the second line were until I looked at the ID
Raymie posted. The bold MOR was easy.
The ID reads: