>Is this the sort of thing that could be fixed by a competent >technician?
Without some more data, we can't advise you either way. Which AF mode, AF-area mode, AF point(s), aperture, shutter speed, etc...
I doubt whether many members will be inclined to view even the JPEG's you posted, as they are 13MB each. Try posting smaller versions (perhaps in your gallery here) - we will still be able to see any big problems that exist.
If the ruler was used at an angle to the sensor as an AF target, the results mean virtually nothing. Only when a flat target is used, parallel to the sensor, can you be absolutely sure about what the camera thinks it's focusing on.