What was found
PTRIM MAIN INOP WARNING MESSAGE DURING DECENT.-C/A-FOLLOWED FIM TASK 27-43-00-810-801-A. REMOVED AND REPLACED HORIZONTAL STABILIZER CONTROL UNIT IAW EMB 140 AMM 27-40-01. OPC FAILED, MESSAGE REMIANS ON EICAS. FURTHER T/S REQUIRED. PERFORMED CMC DOWNLOAD AND FOUND "CTRL WHEEL TRIM SW FAULT" MESSAGE. REMOVED AND REPLACED FO CONTROL YOKE PITCH TRIM SWITCH IAW EMB 140 AMM 27-40-03 OPC FAILED. FURTHER T/S REQUIRED. CLEANED AND INSPECTED CANNON PLUG P1085 AND P1086. RESECURED AND PERFORMED OPERATIONAL CHECK OF HORIZONTAL STABILIZER TRIM SYSTEM IAW EMB AMM 27-40-00. OPC GOOD NO FURTHER DEFECTS NOTED. HORIZONTAL STAB SWITCH ASSY P/N 145-63000-401