This is the kind of adjustment to internal parts and service advice all companies that care about their customers give out to their service departments as a continual ongoing practice.
Releasing it like this, with no context, or the numbers or percentage of affected units, as Canon know very well, will just cause hysteria amongst a vocal few, many of whom won't actually own the lens, panic amongst many that do but don't have the "issue", inundation of service centers who will not replace anything just because "it made a noise once", and a host of other entirely negative outcomes.
Doing this like this is not a positive thing to do by any measure or rational. You are in a unique position to cause or limit any backlash, releasing confidential documents like this needs to be done with the greatest care, a huge amount of back story and lots of context. I'd suggest getting the opinion of a very good and expensive internationally savvy corporation lawyer too.
I dearly hope this is not a page hits kind of deal.
I don't think it'll bring a spike in page hits and I understand your points.
My issue is the same as the person that sent me the documents, Canon charging for repairs on a defective design. I am trying to get proof that is actually happening and going over our repairs at Lens Rentals Canada and asking others if they have any data on the matter.
I have no problem with silent recalls and just putting "optical adjustment" on the receipt and charging someone $50 to cover shipping and any other incidental costs and being done with it. However, to charge someone $450 to repair something you know is faulty by design just doesn't seem right to me.
You are right. I had a problem with the 24-70 of Tamron. It was a faulty design (wrong circuit board that caused a battery drain while the lens was mounted to the camera). Tamron charged 0 euro. It was fully covered by the warranty (incl. free shipping). That is what you should expect from a company in such a situation.