hifi engine

Sansui 8080DB.Technical problem with Driver board F-2624

Resistors R63 and R65 Left Hand Channel.
Resistors R64 and R66 Right Hand Channel,
are shown in circuit diagram as being pairs of 330 ohms, BUT
this is NOT so, on the actual board.
An explanation is reqested from a Sansui 8080DB Technical expert.
Cannot proceed without your help.