Is repairing/replacing a broken cruise control difficult? I seem to see that mentioned a lot on the forum. Are MB cruise controls more finicky than those used by other auto manufacturers?

I have a friend whose cruise control is not working (W126). It's not a big issue, but it got me thinking about it. I use mine a lot.

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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles