NAD 514 CD Player - two different Versions (KSS-210A and KSS-212A)

[tiefbassuebertr]

A friend of me have problems with read in TOC. His version uses a KSS-212A.

In the present service-manual is mentioned the KSS-210A - go to
https://elektrotanya.com/nad_514.pdf/download.html

Is the version with KSS-212A a later series and exist therefore a second service manual resp. an additional supplement ?
On the web I don't find any information.

Under
http://vasiltech.narod.ru/CD-Player-DAC-Transport.htm
both types listed.

Thanks for an advice.