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CALGARY — TransAlta Renewables Inc. lowered its financial guidance for this year as it said it has found cracks in several foundations of the turbines at a wind farm in New Brunswick where a tower collapsed earlier this month. The company says the discovery of the sub-surface cracks means the foundations will likely need repairs, and if replacement is required, costs are estimated at $1.5 million to $2.0 million per foundation TransAlta Renewables suspended operations and began an investigation