For those who don't know about Canon factory repair services...
1. They don't always fix the problem the first time. Sometimes they do something that seems like a shuffle and send it back with the same problem. Happened to my purchased-new 24L recently and 24-70L not-so recently (4 times I returned the 24-70L before they finally fixed it).
2. Strict on the warranty policy duration. 6 months is the duration of the repair warranty for same-problem repairs after something has been fixed, BUT their reps can and will tell you that the warranty is only for 90 days. Hold your ground and send proof of the 6-month warranty if necessary. Keep your paperwork! The 24L I sent in is exactly 1 month out of the repair warranty policy limit of 6 months and they are not honoring it, so they want to charge me to fix it.
3. Repairing a simple backfocus issue can cost $175 or more! Either get your repairs under warranty or expect to pay out the rear for something that can probably be fixed with 30 seconds of screwdriver effort by a Canon repair rep. It feels exactly like being bent over a desk by a person wearing a Canon ski mask and a dirty grin.
4. Sometimes fast, sometimes very SLOW service.
5. Consider Canon professional services (CPS) to knock off a percentage of the repair costs. Anything helps since they gouge so much.

. i have sent alot of stuff to canon over the years. in fact i sent a 1ds mark III and 24-105L to Irvine the other day. my stuff is always repaired quickly and usually back to me in less than a week. sure, i had complaints in the past but nothing major considering all the excellent and courteous service i have received.
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