My experience: I took a few apart, including trying to adjust a low cost Marantz.
the lasers get old/weak. perhaps the cd layer works, but the sacd layer needs a spec more power.
the first to go is your problem, unable to read SACD.
A fine height adjustment is needed to position the laser so it’s beam focuses/finds the sacd and cd layers.
Adjusting for CD layer is easy, the very fine adjustment to read the SACD layer is hard.
They ship them all over the world, and they stay aligned.