That is interesting and a little concerning as I also have a dead 975 with no output from the headphone jack. I bought mine in late 2012 so the age is similar.

One question: The repair cost was reasonable enough so that you didn't consider buying a new one or upgrading to the 976?
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2