As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH TO SDF - WHILE CLIMBING THROUGH 12,000FT EXPERIENCED A NOSE DOWN PITCH TRIM RUNAWAY. ACCOMPLISHED PITCH TRIM RUNAWAY MEMORY ITEMS AND DECLARED AN EMERGENCY. LANDED IN IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE CAPTAIN'S PITCH TRIM SWITCH, AND IT WAS OPS CHECKED GOOD.