As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CARGO DOOR LIGHT CAME ON AT FL 310. PERFORMED EMERGENCY CHECK LIST AND LANDED AT TYS. ALSO, DOOR UNSAFE RED AND LATCH UNLOCK AMBER LIGHTS ILLUMINATED. FOUND SMALL HYDRAULIC LEAK ON SLIDING LOCK BAR ACTUATOR LINE. TIGHTENED, OPS CHECK GOOD.