What was found
AFTER CONDUCTING A 100 HR INSP. THE ACFT WAS GROUND RUN FOR OPS AND LEAK CHECKS. DURING GROUND RUN THE BUSS TIE MESSAGE WAS DISPLAYED WITH NORMAL OPERATION OF THE ELECTRICAL SYS. A SHORT TIME LATER THE BUSS TIE CIRCUIT BREAKER POPPED ON THE OVERHEAD SWITCH PANEL. THE CIRCUIT BREAKER WAS RESET WITH ANOTHER POP OF THE BREAKER. A LT POWER JUNCTION BOX WAS ORDERED AND REPLACED AS RECTIFICATION OF THE SNAG. THIS IS THE FIFTH CHANGE OF THIS COMPONENT SINCE NEW. ENGINEERING IS LOOKING INTO THESE FAILURES TO RESOLVE THE CONTINUING SNAG. THE ACFT RUNS A NON PARALLELED ELECTRICAL SYS WITH A BUSS TIE RELAY THAT CLOSES UPON A GENERATOR FAILURE. THE BUSS TIE MESSAGE DISPLAYED DOES NOT SIGNIFY A BUSS TIE POSITION, RATHER IT NOTIFIES FLIGHT CREWS, THE BUSS TIE IS IN THE WRONG POSITION FOR THE MODE OF OPERATION.