My guess:
1. Broken sear spring (no tension on sear, allowing trigger to stay up/fired, which blocked safety, which safety return rod prevented lever from opening since it was in a bind). Old style sear spring breaks are common. That's why with new style single piece spring and with improved coil spring opening lever spring, the 1910 improvements are the most desired.
2. Dirty/hardened grease.
3. Trigger spring broken (very small spring).
4. A combination of any two of the three.
If both hammers dropped and you got it open, it can't be hard to fix.
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