internal stair squeaks

Hello all,

I have recently had a tradie around to repair some internal stairs as they were quite noisy.
He glued the back of them and cut some wedges to go in behind them to fill the gap where the wood had shrunk but they are starting to get noisy again.

I was advised that the stairs were never glued when they were put together and that to cure them correctly they would need to be dis-assembled, glued and re-assembled.

Is this the only way to correct this problem?

Thanks.


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