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It looks like if you can get that bolt and soldered on under board shield off you can work on the board without removing the board.
Be aware if you plan to power it up before fully reassembling it that you will need to jumper any desoldered board ground to chassis. PCBs of this period usually did not have a contiguous ground plane, but instead had a few separate ground traces that each went to one of the board solder mounts...The board solder mount grounds effectively tied together thru the chassis. If any solder mount is disconnected or has a bad joint the portion of the board it grounds will float and the circuits that use those ground points won't work (until reconnected to chassis ground).
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