Thanks Dave!
Although the multitude of texter markings on the back of the primary mirror indicate that somebody spent a lot of time trying to correct the tilt by trying many different orientations, I have not found any evidence to suggest that the error was introduced after the scope left the factory.
This morning I completed the reassembly of the OTA and placed it back on my EQ mount. After adjusting the secondary mirror to get a centralized retroreflection of my laser, I had a look down the tube from a distance and I was pleased to see concentric reflections.
I can't set up the artificial star due to the miserable weather we are having, but I'm confident that the scope is fixed.
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