The Sony AV-3600 service manual was what I needed for the repair of this unit
Thanks for the good service
Dave
Text excerpt from page 10 (click to view)
1-4. BEZEL ASSEMBLY, H1 BOARD REMOVAL
1 Before removing the bezel assembly, secure
the picture tube by attaching two screws to the picture tube shield at the positions shown with an arrow (diagonal two places) to prevent the picture tube from falling. (Use the screws +BVTT 4 x 8 that fix EMI shield.)