Apparently the lever was over-tightened. The crack is right next to the clamp bolt head. I'm not expecting a lot of support from the bike shop so I'm wondering whether it's fixable or do I need to replace it the hole lever assembly?
Shimano.com doesn't list a part number for the casting but do list part numbers for every other piece of the lever.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: 04 XT Dual Control cracked clamp