Phalenopsis yellow ring spotting

[Longroots]

Hi,

I don't like the look of these spots on my phals newest leaf (and what I think is sunburn on my bottom one). One leaf you can see is clearly visible both from the top and bottom of the leaf, and has yellowing and green circles. I know you can't tell for sure without tests but they're expensive.

Does this look a little threatening? I already have an Aeridis quarantined and some new orchids quarantined in another room so can't quarantine it elsewhere really.

I just want some advice.