An investigation into a gas leak that closed Kazakhstan’s vast Kashagan oil field less than a month after it first started pumping crude found has more potentially problematic locations along an onshore gas pipeline, raising fears of further delays to the $40 billion project. A prolonged halt at Kashagan, which has been plagued by years of delays and cost overruns, could be a drag on the finances of the consortium behind the project, which includes Exxon Mobil Corp. […]