Some carpenter years ago thought that two nails would be enough to hold the stairs up. They did, for a decade or two, but they would eventually fail when the stringer began to split around the nails.
Remove the old nails to free everything up. Use the 3.5 ton floor jack to push the stairs back into place. An aluminum plate and wood glue to splice together the split stringer. Quite a few new bolts, not nails, to hold everything together. A bit of 3/8″ threaded rod on the other stringer to secure it to a joist. I think everything is secure, solid underfoot again. I just need a little paint to cover over the new work.
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Not quite something you would expect a normal engineer to be able to fix eh?
Most engineers I know would be perfectly capable of repairing this. Engineers tend to be pretty practical. Scientists on the other hand…