10:1 the conductor plate is not bad, since the fluid in the TCM will cause those symptoms too, but at your mileage it isi not necessarily a bad idea. Have him check the solenoids, and replace any questionable ones while at it. I don't think this points at all to early trans failure unless he sees some unusual swarf in the pan.
Also do the shifter linkage bushings - it's a tight squeeze and he probably has the tool for it.

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