Definitely needs repotting... mushroom is a sign of excessive moisture and broken down mix. Remove it from the pot, clean off as much of the old mix as you can. If the outer part of the roots is brown and mushy, remove it. You can leave any of the stringy centers of roots that don't break lose easily - that are capable of hydrating the plant (inefficiently but better than nothing) and will serve to stabilize the plant in the new (relatively large) bark that it should go into. Water it well, then let it dry out for a few days before watering again. (New bark will dry out much faster than the "mud" that it no doubt is sitting in. New bark will encourage it to produce new roots, which I am sure that it needs.
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