Clean your phal with Neem oil or spray with a bactericide such as Cosan or Physan 20. Get Physan 20 that is good for plants with iffy roots. Make a mixture up and soak the roots for 5-10 mins depending on the size of the roots. Then hang the phal upside down so the water can drip off. Also, keep it in a nice windy spot after dipping, so the plant can dry off quickly. A small fan works nice on calm days. You can also soak potting stuff in the fungicide or physan, although I mix it a little weaker for this.
After the plant dries out, repot into the soaked potting materials and then place the plant in a well ventilated shaded corner to rest for about 1-2 weeks. After it has adjusted slowly move it back into it's normal spot. I have been able to save a few plants with the beginnings of rot using this method. Just know, you must be aggressive and cut aLL black stuff off. I use a pair of long tweezers to pull stuff from the nooks and crannies. A nice stream of water from a hose is good at getting small pieces of material off roots as well. Good Luck
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