Hi and thank you for using Just Answer
Per your question, the freon gas has leaked out and the warmth you feel is the heat from the compressor.
As for repairing, I don't know if they can. These portable units are set up in such away that you would have to buy a complete internal replacement unit, and for the price you would not be to far off from getting a new one. If you have any other questions please ask. I wish you the best