It sounds like the Canada repair center may be a non-Ruger entity that contracts for Ruger repairs....
You might want to consider making a call directly to Ruger CS in the US to see what they have to say.
It also might be a Canada thing, because my 1960 (60+ years old) cost me the bubble, including shipping (Ruger CS sent me a prepaid shipping label), to repair my .22 magnum only Single Six RSSM cylinder chamber issue ( 2 of the chambers did not accept ammo the full depth, and empties had to be pounded out after removing the cylinder).
I called to see if I could sent just the cylinder, but the CSR told me to send the entire gun,
I got my gun back 2 weeks later - Ruger had replaced the magnum cylinder, fitted/installed a LR cylinder numbered to the gun, and returned the original magnum cylinder with a "unserviceable" tag tied to it.
So now I have a factory-original 3-cylinder gun ! ( along with an enclosed letter & N/C invoice to prove it)
I was so happy, that I made a new bed for it to sleep in between outings:
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