How to fix a broken cable on Marshall Major II Bluetooth

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How to fix a broken cable on Marshall Major II Bluetooth, Left earcup casing contents: crwdns2935265:00crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Left earcup casing contents

Left earcup casing contains:
Lithium battery
Button and button connection PCB
Left speaker

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