I wouldn't.
It's generally a bad idea to pay 100% for work that's not 100% finished. I'd make a reasonable payment, based on the completion. If you are about to make a payment, leave unpaid a portion for the light and the leveling, based on the assumption that it will be the complex fix in the fall. Then pay for completion as it occurs.
But . . . it's Ohio. It's cold. Why don't you postpone pool opening and have him fix it now? That way, it's not hanging over your head or his.
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