There are companies who do this if you are out of warranty. Ramjack comes to mind.
They basically drill holes in the slab and pump a slurry of fast setting mud/concrete in the void to lift it.
The question is however, would it be less expensive than just taking that small slab out and re-pouring it......?
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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