Beallara with chlorotic mottling/leaf patches

[KleioP]

Hi all,

I am relatively new to orchids, and trying to find my way around, especially with identifying pathogens! About 3 weeks ago I first saw weird mottling on a single leaf of a tiny growth on my Beallara Joe's Drum. I unpotted the plant (which was overdue, it was still in the peat mix in which I received it) and found rot in the rhizome. I cut off infected tissue and potted in fresh bark but a few days later the leaves of the bigger rot-free growths started showing the mottling.

I have had this plant 2 months now. It did get intense sun and heat for a couple of days, so I moved it to a different location where only weak sunlight reaches it. The room where it grows has day temps of about 25oC these days, which is I think a few degrees above the recommended maximum.

Can someone tell me if this looks like a virus or something else environmental? Something to do with heat stress or root damage from the repotting? If it is a pathogen, should I worry that other plants might have it (I have to share water unfortunately). Thanks a lot for your help!