I needed an oil change and some AC service anyway, so I ended up taking mine into an Indy shop that I've used before.
Luckily, when I turned the car on this morning, the compressor and bags both worked so it was a comfortable ride.
They confirmed the bags were bad and quoted $875 for replacement. Since I don't have a jack, I told them to go ahead with the work.
If it drops again, I'll follow Osman's steps for replacing the relay and servicing the compressor/desiccant/valve.
Thanks for the earlier replies.
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