Help, problem with Tokina 12-24

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I have a problem with my Tokina, it locks up and I get 'Err 01 communications between the camera and lens is faulty. clean the lens contacts'. After much testing I have narrowed it down to only at 12 to 15mm and smaller than f5 that it has a fault. It works fine through the whole aperture range at 24mm but when at 12mm I can't use past f5.
 
I had a similar problem with a 24-105 and it turned out to be the aperture unit. This has a ribbon cable and the consistant flexing caused by zooming in and out damaged the cable.

I don't think you habe much choice but have it serviced.
 
I forgot to mention that I have tried this on two different bodies with the same result.

Also does anyone know where to get it serviced?
 
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