Leaf Issue : virus? / bacterium? / fungus? / ???

[Stray59]

Boy - I would hit it with everything I have! It may be fungal or bacterial, but it also has many traits of viral. I am not a disease expert, but the fact that this showed up after the stress of bringing it back from a trip - well that is such an old viral trick! A little stress can allow a virus to overwhelm an otherwise healthy looking plant.
I would test the leaves with a test strip to be sure.
It sure is unsightly! Keep us posted on what you find out!
Steve