Upload & Sell: On
Canon Canada refused to even take a look at 200 f/1.8 as early as 2007 or thereabouts.
Independent camera repair shops such as Sun Camera in Toronto will gladly work on the lens, yet if they can not get a spare part for it, should one be required, obviously the repair can not be completed.
Some spare electronic assemblies are still obtainable from eBay sources, but at a high price. For example, I've seen spare AF units listed at $500-$800, and then there is shipping to be added, tax and installation labour as well which in that particular case of a failed AF unit would be quite extensive.
Therefore, the best risk minimization strategy is to steer away from well (ab)used lenses, which at a first glance might appear priced favourably, yet in case of a failure, you'd be faced with a very expensive repair, if repairable at all.