If its got leaves, then obviously its still alive

But, by your description of the yellowish leaves and spots, Id say that a, it could be too wet... keep yucckas dry.
b, where do you live? Yuccks tend to go yellowish and spotty over winter. c, or perhaps its not getting enough sun, and over head watering will cause a fungal spot on the leaf.
Is it in a pot or in the ground?
It should live... they are very tough, give it a water with seasol or simmilar, water over leaves, and soil, then try and let it dry out...
hope that helps

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