Logically you seem to have tried to eliminate errors. If tuner one works in slot two, it would seem to indicate that the slot is ok. If tuner two does not work in slot one, it would seem that the tuner module may be the culprit. Just for the heck off it, have you tried back loading an older image to see if you still have the same problem? Or, even another brand of image?

Worst case, if you need another tuner:

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Damn, they're getting greedy......