Could be something fundamentally simple
Any computer repair shop could find what is wrong, then have them fix it, order a part have them fix it, or send it to a specialist.
service manual is available on hifiengine.com
btw, the lasers do get weak, the ability to find the SACD layer an early sign. If yours has had a lot of use, even though sounds wonderful, consider than relative to repair cost.
when I chose my vintage Sony xa5400es I checked, found replacement laser assemblies were still available
I don’t see any parts listed for yours on hifishark at this time.