If they are old leaves from when it was unhealthy then they will not recover. On mine some went 'leathery' but stayed green and when the plant recovered those leaves just stayed 'leathery' until they finally fell off.
Give the old yellow leaves a gentle tug, if they fall away then the plant was ready to drop them anyway. If they stay put the plant is still wanting to keep them. Healthy Phal leaves don't pull away from the plant easily so a gently tug is a good test.
If you don't like the look of them however, and they are yellow, then you could carefully cut them away even if the plant doesn't let go of them. You can then dab the cut with cinnamon (the spice) to help stop infection, although if the leaf is very dry and almost ready to drop that may not be neccessary.
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