And the tests arrived from Taiwan! $250 including shipping for 50 tests. I tested both plants with symptoms (neighbors) and a sigh of relief... both negative!
So, assuming this was some sort of bacterial or fungal infection, I proceeded to spray the leaves with Physan, cut the damaged parts away, sprayed with cuts with Physan and "sealed" with cinnamon. If these were Phalaenopsis I would've done a light treatment with copper.
It'll be about watching culture now, it will probably benefit from increased air movement and pot flushing. I also repotted it, it has a good root system but not "great," so I changed the medium from LECA to bark. I think the LECA might've held on to too much residue.
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