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Hi, I am Mike, welcome. I'm reviewing your question.
The cable could have come loose on either end or simply broken the cable.
It's best to download some photos of a new latch mechanism so you can try to figure out how it unlatches, so you can somehow get a long screwdriver or something similar up there from underneath and pop the latch open. Look for where the cable attaches and try to pry that in the direction the cable would pull it if it were working.