The bearings should be 2MM207WI DUL.
The 2mm and DUL signify a matched ABEC-7 set. The W indicates angular contact bearings.
I have seen JM 207 radial bearings in spindles. They were put in to save a few bucks. They are ABEC-3.
Try measuring the runout if you suspect the bearings. Also, you may need to have the spindle taper reground in a new set of bearings to bring runout to proper levels.