Aketza's case to be heard

Aketza Peña, the former Euskaltel rider who tested positive for nandrolone at last year's Giro, will get his case heard in front of CAS July 3. Aketza's B-sample reportedly confirmed the findings of the A-sample, and was suspended until the 9th of August 2009. Why he's challenging the verdict I don't know, anyone got a clue?