What was found
AFTER DEPARTURE AND DURING CLIMB (TEB) NOTICED STAB CH 1 INOP ANNUNCIATION ON EICAS. RETURNED TO AIRPORT (TEB). MAINTENANCE TROUBLESHOT TO MCU (MOTOR CONTROL UNIT), REPLACED MCU, OPS CHECK AND RETURN TO SERVICE. DEPARTED TEB AND UPON ARRIVING BAF, STAB CH 1 INOP ANNUNCIATION INDICATED ONCE AGAIN. MAINTENANCE TROUBLESHOT AND COULD NOT DUPLICATE PROBLEM. DEPARTED TEB AND UPON ARRIVAL AT CYUL, STAB CH 1 INOP ANNUNCIATION INDICATED A THIRD TIME. MAINTENANCE TROUBLESHOT ENTIRE STAB TRIM CONTROL SYSTEM AND FOUND BAD WIRE IN JP255 CONNECTOR IN AFT BAY. REPLACED ENTIRE WIRE FROM P255 TO P256. F/T STAB SYSTEM IAW M/M 27-40-00 AND RETURN TO SERVICE.