hy someone decided that is ok to let the lathe running with a novice what could go wrong ?

i fixed today 3 tools + toolholders, and align the turret

... but there is a problem with the spindle : i took down the chuck and the flange, and i put a comparator on it, and all is ok, but there is a sound that i dont like

i think that one bearing got screwed ... something is noisy

please, i never took down a spindle for verifications ... please, what should i do ? is there something that i should be carefull ? are there some basic steps ?

lb3000ex2, osp300 ; kindly !

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