I amof the school that says leave well alone with autoboxes somechange the oil others not but I have heard so many sorry stories of gearbox failure after a oil change ,I agree with Rich itcertainly does dislodge debris and its this that causes all the problems.
It may be worth while looking for a complete recon box or have yours completely refurbished by a specialised firm,has the garage a clean room if not they should not be touching autoboxes.
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