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i did have it out looking for a drain that was in the middle of 7562. The drain was not frozen and I could get at least 2 inches through it. I did not try to pour water in it.
well you need to pour some water in the drain and see if it goes down. its the only way to tell if its blocked.
I put already everything back but I should see within a few days if there is some ice at the bottom. Let's keep the case open for a few days.