As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL270 WITH AUTOPILOT B ENGAGED STAB OUT OF TRIM ILLUMINATED. TRIM WAS OPERATING NORMALLY AND AUTOPILOT LEVELED OFF AT 310FL AND STAB OUT OF TRIM LIGHT WENT OUT. ON MASTER CAUTION RECALL SPEED TRIM FAIL ILLUMINATED. GROUNDED - YES. NO FAULTS FOUND. DUE TO HISTORY REPLACED FCC B PER B737-900 AMM TASK 22-11-33-400-801.