Hi! Picked up my upright for a bit of fun tonight and, surprise, I see a crack! Now I need your help! I'm mainly an electric bass player, so the upright, well I play it at home for fun and that's it. But I love that thing and take care of it. It hasn't went to the luthier much, but since I don't carry it around and it stays in the same room, were I try to control humidity as best as I can, I wasn't worrying. My electrics are all fine and I barely need to just setups in season changes. Anyways, here's the thing. My upright is a plywood Strunal. It has a little bump where the sound post is. On the front, you can barely see it, but it is there, just under the foot of the bridge. On the back, it's there too but it seems, maybe, to have gotten bigger. A luthier once told me not to worry about that too much, he said it happens and it's not all that bad. But tonight, I saw a small crack just were the bump is on the back. The crack is about a half a inch long. It is superficial right now, it looks more like a crack in the finish but I can see a thin pale line, and feel it too. Now my immediate reaction was to detune the upright bass a little, to remove some pressure. Am I doing the right thing? What else can I do to help the bass right now? I'm getting nervous about this and I won't have access to a luthier for at least 3 weeks, as most businesses are closed around here right now because of the Covid-19. I really need your help!