As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: -- DECISION WAS MADE TO RETURN TO MIA - EMERGENCY DECLARED; AIRCRAFT LANDED WITHOUT INCIDENT -- FEEL DIFF LIGHT ILLUMINATED AFTER TAKEOFF AND THEN EXTINGUISHED. BOTH AUTOPILOTS WOULD NOT ENGAGE. FOUND A DUAL CHANNEL AUTO STAB TRIM CUT OUT FAULT. REPLACED IFSAU EIN M1474 IAW AMM 22-11-37. REF MIC 7760210.