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It's salvagable at this point, but how was it doing before repot and did you feed with repot. Maybe the soil you used to repot was mixed too "hot". Either way I'd get a remote sensing "weather station" so you can keep an eye on temps and humidity even during dark period.
A few days before i repoted the leafs had turned brown and when i repoted i cut back all the died leafs. The branches have still got all the buds and they look to be still growing. I have opened up the tent and have two fans blowing air at her.
You really need to give more information about what your doing to the plants. What is the soil ph? What is the soil and what is in it like dolomite lime? What are you feeding the plants(be specific) and how much? More information will get better answers that you can at least use on future grows to prevent this from happening. I would not have two fans blowing on the plants. Better to have them indirectly blowing on the plants.