It appears the 1.10 changes to remove Duct Tape repairing many things have left the First Aid Kit without an item that can repair it. I have a Badly Damaged first aid kit that was badly damaged when I found it, with its usual contents (bandage, blood collection kit, blood test kit, IV start kit). I've tried to repair it with Duct Tape, Sewing Kit, Leather Sewing Kit, and even Electrical Repair Kit, Weapon Cleaning Kit and Sharpening Kit too. I have tried various combinations of which direction to combine the items. It always shows as red instead of orange, or just puts the item inside the first aid kit.