What was found
IN CRUISE AT FL 340, AMBER DASHES ON PITCH TRIM INDICATOR. CONTACTED MX CONTROL VIA AIRINC. NO CHECKLIST SPECIFIC TO PITCH TRIM INDICATOR. RAN PITCH TRIM FAIL CHECKLIST AND NORMAL INDICATIONS CAME BACK. NO EICAS MESSAGES DURING INITIAL AMBER DASH POPULATION. FLT CTRL NO DISPATCH EICAS MESSAGE POPULATED WOW IN SEA. REMOVED FROM SERVICE. C/W E175 FIM 27-43-00-810-823-A. PERFORMED FLIGHT CONTROL SYSTEM (RETURN TO SERVICE) TEST IAW E175 AMM 27-00-00-070-801-A. TEST PASSED. FOUND TO BE TRANSITORY CONDITION. NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.