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Need help with partition’s file system error

My lifetime collection of music and audiobooks lives on 2 partitions of a My Book. The partitions themselves sail through Disk Utility for Catalina but the My Book itself returns a “problem with the EFI system partition’s file system (-69766).” I hope to replace the drive in a month or so but, until then, is there anything I can do to straighten things out? If not can someone tell me how it got this way?

Here’s a link to the Get Info for the disk and if needed.

Here’s the Partition Table

Thanks for your kind help.

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