An obvious thought is, could be your top lever spring broke. A good gunsmith if available would pull the stock first thing, which requires good screwdrivers and technique, plus a long punch for the sear pin. Once the stock is off it should be clear what broke.
When working on my own double guns, I don’t own a pin punch long enough to drive the pin all the way out. Myself, I wiggle it the rest of the way out out once driven. Reassembly requires, for me, a slave shaft of similar diameter that is pushed out as the sear pin goes back in. I can’t really recommend working on your own guns to most people but I do all my own work when I can, so there is that. Once you know what’s wrong, you could check Numrich or eBay for a replacement. Good luck!
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