Floppy discs and their drives are notoriously fragile.
I'd start with making sure that the drive head is clean and not rusted. Test on a new floppy disc.
I'd be very surprised if the standard LOAD command would still work, and I'd start with making a block copy of the disc(s).
You can access individual disc blocks from within BASIC, I wrote a disc editor at the time to do just that.
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