What was found
PITCH TRIM FAIL CAUTION MESSAGE DURING CLIMBOUT. UNCOMMANDED NOSE DOWN PITCH TRIM OCCURRED. QRH PROCEDURES RESOLVED PITCH TRIM PROBLEM. FLIGHT 4089. TROUBLESHOT PER ERJ FIM TASK. A/P QUICK DISCONNECT OPERATE AS REQUIRED. PERFORMED ERJ FIM TASKS. OPS CHECK GOOD. PERFORMED GVI ON WIRE HARNESS PER SB, NO DISCRPENCIES NOTED. PERFORMED DETAILED VISUAL INSPECTION OF HORIZONTAL TRIM ACTUATOR AND HORIZONTAL TRIM ACTUATOR NO BACK MECHANISM. VERIFIED HORIZONTAL STABALIZER TRIM RESOLVER POSITIONS WERE WITHIN LIMITS. REMOVED AND REPLACED HS-ACE. NO DEFECTS NOTED WITH HORIZONTAL STABALIZER TRIM SYSTEM. A/C OK FOR SERVICE.