Need help calculating Downtime

I have a work sheet (Attached) that shows a days work followed by the source that is working I need to account for ALL downtime from one specific source when they stopped to when they start back up. If you look in Column D I have manually entered in the formula's I need to make this happen. My question, is their something I can make in VBA or macro that will do this?Downtime.xlsm

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