Got $50 credit left that would usually go into the travel bank if it were online. Since it's not online, I just upgraded my super-long 1hr 35min, SFO - LAS flight to Econ+, via UAL app. I'll update its progress.
And if the UAL travel bank ever goes back online, that $200 will be gone in one or two clicks. No more waiting around for issues like this to arise, like this months long maintenance thing.