Where exactly is the problem? The yellowing of the bottom leaf might be normal. Scale is a visible pest. If you have it, you should be able to see it or feel it, especially hard scale. On the other hand your roots don't look so good. Have you taken a look at all the roots lately to see how they are doing? It looks like the top ones are rotting away.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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