Took my R60S into firestone for a set of new tires and alignment. They failed to mention this to me when the car was picked up but noted it below on the invoice.

"Note: crack in R/R lower control arm/knuckle assembly, see dealer
for replacement & alignment (needs adjustment)"

I couldn't see any visible cracks by the time I got home. I should be ok with changing out the control arm if needed but what part should I be looking at if it's the knuckle assembly?