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Unfortunately it doesn't look like you'll have much luck finding someone in country to do the work for you. Korth still doesn't seem to have the tooling to work on the mil scopes locally (I know Leupold USA does the reticle changes in house now since their split with Premier Reticles). Having said this, I'm glad I got my 10x40 M1 (Gen 2 reticle) purchased before Premier stopped shipping up this way - as their service and quality of work was quite good...
Korth Agencies does not have the facilities to do work on the Mark 4 series of scopes.
There was a rumour going around that they were trying to get equiped to work on them, but nothing has panned out so far.
Mark 4 scopes have to be sent to Leupold USA for warranty work or modifications.Unfortunately this requires Export permits/paperwork to get your scope back into Canada.