His pack is only a month old and only has 30 cycles on it at most..
His cells should be pretty well balanced at this point.
If his pack was a year or more old or had hundreds of cycles, I would give him different advice.
This is the best time for him to test full AH capacity...
Even if he has an errant cell group, even dropping it to 2.0v once is not going to be detrimental.
I've had a cell group (on a 36v 15ah) go to 4.0v once and another group drop to 1.7v once, and my pack STILL holds a 90-95% capacity after 2.5 years.