That's a nice looking plant! The browning at the end of the leaf in the first picture happens on a lot my my strap leaf paphs also. I have no real idea what causes it, maybe low humidity, but it doesn't seem to affect the plant much.
I don't really see much yellowing in the picture, but that can be caused by various cultural practices. Too much sun, too much fertilizer, too little fertilizer, needs repotting, and so on. You just need to be consistent in your culture and then start changing 1 small thing at a time and see what changes.
Bill
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