The manual was very accurate for the part that I was changing, I was able to order the correct part and had no issues with the replacement procedure. However, I was expecting to have more detailed repairs for the lower drive unit.
Text excerpt from page 8 (click to view)
AV-21P8
s CENTER ADJUSTMENT (Page 25)
[SUB MENU 6. CENTER] Setting item TREBLE BASS (Do not adjust.) (Do not adjust.) : Do not adjust. Initial setting value (fixed) +2 +3
VICTOR COMPANY OF JAPAN, LIMITED TELEVISION RECEIVER DIVISION 1106 Heta, Iwai-city, Ibaraki-prefecture, 306-0698, Japan AV21P8VT-CK #3 CTH 0009 CRT