wart-like spots on BLC. Hawaiian Stars

[doggie doc]

Hi All,
I am a neophyte orchid fancier - and have a plant that suddenly developed blotchy leaf discoloration post-bloom. It is a BLC Hawaiian Starts 'Paradise' (B. little stars x LC Mem Robert Strait). I purchased it off the "must-go" table at Lowe's about 16 months ago as a next-to-dead plant. Being a newby, I figured it would be a good practice effort (nothing to lose, right?). I brought it home, potted it in terra cotta with coarse orchid mix.

Last summer it put out 4-5 new bulbs/leaves; last fall 3 flower spikes of 2-3 blooms each; last flowers just faded maybe 2 weeks ago?; Roots are firm, pale white/green, and healthy looking.

As the blooms began fading, the leaf color went from an even green to lightly mottled. Now distinct yellowing to dark brown spots have formed - some coalescing - which bulge from the back surface of the leaf (see pics - sorry for the quality). Spots appear confined to the original leaves of the plant (new growth still appears healthy). I can find no evidence of insects, though my experience is limited to mealybugs.

The plant is housed in an indoor greenhouse - temp roughly 65 evening, 75 day, 12 hours full spectrum light daily, 55% humidity, watered every 7-10 days, fertilized with Jack's monthly during the winter, bimonthly during the summer.

Am I dealing with a virus? Should I just chuck the plant?? This is such a bummer after seeing it in glorious bloom only a month ago, and feeling like maybe I was the "orchid-whisperer" for saving the pitiful thing.