Fungus or something innocent?

[Stefan Petersen]

Hi Everybody

A few years ago some of you helped me care for this phal which is an heirloom from my grandmother who isn't among us anymore. It went from being distressed to actually blooming now for the first time in years

But now I have noticed that there are these white spots on some of the pieces of bark. I am a bit worried if it might be the beginning of a fungus infection. What do you think it is?

I am not sure if I should repot it or not. It was a very nervy situation the last time, because it meeans so much to me.

I only found the spots on a few pieces of bark in the top. But eventhough the pot is transparent, I am not able to make a thorough inspections.