As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: RETURNED TO CUN ACCOUNT STABILIZER TRIM MALFUNCTION, NOSE DOWN ELECTRIC PITCH TRIM INOPERATIVE. EMERGENCY WAS DECLARED. ACCOMPLLISHED FIM 27-41-00-810-802 FOUND RELAY R850 FAULTY, REMOVED AND REPLACED HORIZONTAL STAB INTERLOCK RELAY R850 IAW AMM 27-41-98-401, ACCOMPLISHED STABILIZER ELECTRIC TRIM SYSTEM TEST IAW AMM 27-41-00-700-803. ALL TEST PASSED.