As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 334 - EN ROUTE DFW-BNA, NOSE GEAR UNSAFE MESSAGE AND NR 1 HYDRAULIC SYSTEM LOSS ON MFDU AFTER GEAR RETRACTION. ACCOMPANIED WITH A LARGE BANG. RETURNED DFW AND ACCOMPLISHED EMERGENCY GEAR EXTENSION. LANDED DFW WITHOUT INCIDENT. REPLACED NOSE GEAR RETRACT ACTUATOR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)