White spots and rotting on Cymbidium?

[HentaTenta]

Hello, just registered and making my post right away, I'm sorry for not checking the forum for existing threads regarding this situation.
I've bought a cymbidium a year and a half ago. It had a spike and it bloomed already.
A month or more ago I started to see these white spots on some leaves coming from one particular pseudo bulb. Now these spots climb higher and spread out to adjacent leaves. Photos are attached.
Also, some of the youngest leaves on a different pseudo bulb are very light colored, are thin, have problems going upright and are yellowing starting at the tops.

What am I dealing with?

I was planning to split the plant in two, should I transplant the bulb that has the white spots? Should I transfer the dead, dried pseudo bulbs as well?

Thank you very much.